A z-test with a z observed of 2.56 (two-tailed) would have a p-value of 0.010467 , which would lead a research to reject the null hypothesis if alpha is .05.
Given:
z - score = 2.56
p value at z = 2.56 is:
p = 0.010467
The result is statistically significant: you can reject the null hypothesis and accept the alternative.
This decision is made at significance level α = 0.05.
Therefore a z-test with a z observed of 2.56 (two-tailed) would have a p-value of 0.010467 , which would lead a research to reject the null hypothesis if alpha is .05.
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PLEASE HELP- I cant figure out this problem
Please I need help please
Answer:
Scale Factor
[tex]k=5[/tex]
Side Congruency
AL ≅ TD
TK ≅ AH
DK ≅ LH
Angle Congruency
∠A ≅ ∠T
∠D ≅ ∠L
∠H ≅ ∠K or ∠K ≅ ∠H
Step-by-step explanation:
Scale Factor
First, to determine the scale factor, I will choose two corresponding segments: AL and TD.
By counting on the graph, I can see that they are the following lengths:
[tex]TD=15\\AL=3[/tex]
Therefore the ratio of the large triangle to the small triangle is 15:3. Written as a fraction and simplified, this is:
[tex]\frac{15}{3}=5[/tex]
5 is the scale factor, or k.
Congruency
Each segment on the small triangle corresponds to the same side on the large triangle. Therefore:
AL ≅ TD
TK ≅ AH
DK ≅ LH
The same goes for the angles, except the angles are actually equal as well:
∠A ≅ ∠T
∠D ≅ ∠L
The bottom of your image is cut off, but I assume the question is one of these:
∠H ≅ ∠K
∠K ≅ ∠H
Hannah's least favorite weekly chore is mowing the lawn, even though it only
takes her about 30 minutes. Her family's lawn is 1,000 square yards, but her
parents are thinking about moving to the country, where they would have 5
acres of land. If the time it takes Hannah to mow a lawn is proportional to its
area, how many hours would it take her to mow 5 acres?
Answer:
12.1 hours
Step-by-step explanation:
You want to know the mowing time for 5 acres if Hannah can mow 1000 square yards in 1/2 hour.
Unit conversionWe can convert the acreage to square yards to facilitate the calculation:
5 ac × (4840 yd²)/(1 ac) = 24,200 yd²
Mowing rateHannah mows her lawn at the rate of ...
(1000 yd²)/(0.5 h) = 2000 yd²/h
TimeAt this rate, the time it takes for 24200 yd² will be ...
(24,200 yd²)/(2000 yd²/h) = 12.1 h
It would take Hannah 12.1 hours to mow 5 acres.
7. f(x)=x2 and g(x)=x-1 Evaluate f(g(3)) =
Si los lados de un cuadrado miden 3 cm cuántos centímetros cuadrados medirá su área.
The area of the square that has 3 cm of side is 9 cm^2
The formula and procedure to solve this geometry exercise is:
A = s²
Where:
A = area of the squares = sideProblem information:
A = ?s = 3 cmUsing the formula of the square area we get:
A = s²
A = (3 cm)²
A = 9 cm²
What is the area?Is the measure of the space occupied by a body bounded by an environment called perimeter, the same is expressed in units of squared side. Example: ft2, m2
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9. [-10, ∞)
Interval notation
The inequality of the interval notation [-10, ∞) is x ≥ -10
The given interval notation is
[-10, ∞)
We have to convert the interval notation to inequality
The inequality is the mathematical statement that shows the relationship between two expression with inequality sign. The inequality signs are less than, less than or equal, greater than, greater than or equal. The inequality consist of different variables, numbers and mathematical operators.
Interval notation is defined as the method of writing subsets of the real number line
The given interval notation is
[-10, ∞)
Convert the interval notation to inequality
x ≥ -10
Hence, the inequality of the interval notation [-10, ∞) is x ≥ -10
The complete question is
Convert the interval notation [-10, ∞) to inequality
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1) Sarah received three fifths of her sister's book collection. If Sarah received 18
books, how many books did her sister have before giving any to Sarah?
The number of books that her sister has before giving any to Sarah is 30 books
Sarah received three fifths of her sister's book collection
Number of books that Sarah received = 18 books
The fraction of the books that Sarah received = 3/5
Consider the total number of books as x
Then we have to find the total number of books
So the equation will be
x × (3/5) = 18
Divide the terms in the equation
x × 0.6 = 18
Move 0.6 to the right hand side of the equation
x = 18 / 0.6
Divide the terms
x = 30 books
Hence, number of books that her sister has before giving any to Sarah is 30 books
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whats this? comment the answer-3.9 = x - 0.9
A vehicle purchased for $27500 depreciates at a constant rate of 8% Determine the approximate value of the vehicle 10 years after purchase Round to the nearest whole number.
The approximate value of the vehicle 10 years after purchase is $11,945.68.
What is the approximate value of the vehicle?Depreciation is when the value of an asset falls with the passage of time as a result of wear and tear of the asset. Deprecation would reduce the price of the vehicle each year.
The equation that can be used to determine the value of the vehicle after 10 years is:
FV = P (1 - r)^t
Where:
FV= value of the vehicle in 10 years P = value of the vehicle when it was purchased r = rate of decline t = number of yearsFV = 27,500 (1 - 0.08)^10
FV = 27,500 x (0.92^10)
FV = $11,945.68
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Which is the better buy?
5,149 pounds of sawdust for $1,132.78
4 tons of sawdust for $2,800.00
Answer:5,149 pounds of sawdust for $1,132.78
Step-by-step explanation:
Step 1 is to convert 4 tons into pounds is:
4 tons * 2000 pounds per ton = 8000 pounds
Step 2 is to find the cost of saw dust per pound in each scenario:
Scenario 1: $1132.78 / 5149 = .22 dollars per pound
Scenario 2: $2800 / 8000 = .35 dollars per pound
Step 3 is just comparing which one is the cheapest per pound based on step 2:
.22 per pound is less than .35 per pound. So the answer is scenario 1 (5149 pounds for 1132.78) is the better buy
Find the missing values for the exponential function represented by the table below.
The missing values for the exponential function are y = 16.875 and y = 25.3125
How to find the missing values for the exponential function?The general form of the exponential function is y = abˣ
From the table, when x = 0, y = 11.25. Substitute the values into the function:
y = abˣ
11.25 = ab⁰ (Note: b⁰ = 1)
11.25 = a(1)
11.25 = a
a = 11.25
Also, from the table, when x = -1, y = 7.5. Substitute the values into the function:
7.5 = 11.25b⁻¹
7.5 = 11.25/b (Note: b⁻¹ = 1/b)
7.5b = 11.25
b = 11.25/7.5 = 1.5
We can now write the exponential function for this case:
y = abˣ
y = 11.25(1.5)ˣ
We can find the missing values now:
when x = 1:
y = 11.25(1.5)ˣ
y = 11.25(1.5)¹
y = 16.875
when x = 2:
y = 11.25(1.5)ˣ
y = 11.25(1.5)²
y = 25.3125
Therefore, the missing values are 16.875 and 25.3125. Option c is the correct answer
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powers of negative integers are always negative. (T OR F)
Answer:
False
Step-by-step explanation:
[tex]10^{-2}[/tex] id not a negative number it means
[tex]\frac{1}{10^{2} }[/tex] or [tex]\frac{1}{100}[/tex] Which is a number with a lesser value than 1, but it is not a negative number.
Factor completely x^(3)-2x^(2)-24x
Answer:
x(x - 6)(x + 4)
Step-by-step explanation:
x³ - 2x² - 24x ← factor out x from each term
= x(x² - 2x - 24) ← factor the quadratic
consider the factors of the constant term (- 24) which sum to give the coefficient of the x- term (- 2)
the factors are - 6 and + 4 , then
x² - 2x - 24 = (x - 6)(x + 4)
then
x³ - 2x² - 24x = x(x - 6)(x + 4)
an overhead wire stretches from the service drop that is 20 ft from the ground, on a building to an insulator on a pole 35 ft from the ground. how long is the wire if the pole and building are 48 ft apart? (assume ground is level.) round answer to tenths.
Answer:
50.6 ft
Step-by-step explanation:
We can use the pythagoreas theorem to solve this problem.
If the service drop is 20 ft from the ground and the insulator is 35 ft, that means that the insulator is 15 ft higher than the service drop.
a² + b² = c²
15² + 48² = c²
255 + 2304 = c²
2559 = c²
√2559 = c
50.6 ≈ c
)A math teacher graded 45 problems in of an hour. At that rate, how many problems
can she grade in 1 hour?
Simplify your answer and write it as a proper fraction, mixed number, or whole number.
problems
Subnt
The number of problem that can she grade in hour is 60 problems
The number of problems that math teacher graded in 3/4 of an hour = 45 problem
Here we have to use the unitary method
The unitary method is defined as the method of finding the value of the single unit.
The number of problem that can math teacher grade in 1 hour = The number of problems that math teacher graded in 3/4 of an hour ÷ 3/4
Substitute the value in the equation
The number of problem that can math teacher grade in 1 hour = 45 ÷ (3/4)
= 45 × (4/3)
= 60 problem
Hence, the number of problem that can she grade in hour is 60 problems
The complete question is:
A math teacher graded 45 problems in 3/4 of an hour. At that rate, how many problems can she grade in 1 hour?
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To show that the point (3/5, 4/5) is on the unit circle, we need to prove that (3/5)^2 + (4/5)^2 =. The distance between (2, -5) and (-7, -5) is The midpoint of the line segment that joins the given points is given by: (, ).
(a) To show that the point (3/5, 4/5) is on the unit circle, we need to prove that (3/5)² + (4/5)² = 1 .
(b) The distance between points (2,-5) and (-7,-5) is 9 units .
(c) The midpoint of the line segment that joins the given points is given by: (-5/2,-5) .
In the question ,
it is given that ,
the points given is (3/5 , 4/5)
(a) To show that the point (3/5, 4/5) is on the unit circle, we need to prove that (3/5)^2 + (4/5)^2 = 1
that is
9/25 + 16/25 = 1
25/25 = 1
1 = 1
hence proved that the point (3/5, 4/5) is on the unit circle .
(b) The distance between (2, -5) and (-7, -5) is calculated using the formula
[tex]=[/tex]√(x₂ - x₁)² [tex]+[/tex] (y₂ - y₁)²
= √(-7 - 2)² + (-5 -(-5))²
= √(-9)² + (-5 + 5)²
= √(-9)² = √81
= 9 units
(c) the mid point joining the points (2, -5) and (-7, -5) is (a,b) that is calculated by
a = (2-7)/2 , b = (-5-5)/2
a = -5/2 , b = -10/2
a = -5/2 and b = -5
the mid point is (-5/2,-5) .
Therefore , (a) To show that the point (3/5, 4/5) is on the unit circle, we need to prove that (3/5)² + (4/5)² = 1 .
(b) The distance between points (2, -5) and (-7, -5) is 9 units .
(c) The midpoint of the line segment that joins the given points is given by (-5/2,-5) .
The given question is incomplete , the complete question is
(a) To show that the point (3/5, 4/5) is on the unit circle, we need to prove that (3/5)² + (4/5)² = .
(b) The distance between (2, -5) and (-7, -5) is .
(c) The midpoint of the line segment that joins the given points is given by ( , ) .
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What is the answer to this question
2 lines 3y-2x=21 and 4y+5x=5, intersect at the point Q. Find the coordinates of Q
Answer: (-3,5)
Step-by-Step Solution:
1. Set 1 equation equal to y
3y-2x=21
3y=2x+21
y=2/3x+7
2. Set the other equation equal to y
4y+5x=5
4y=-5x+5
y=-5/4x+5/4
3. Set the equations equal to each other, and solve for x
2/3x+7=-5/4x+5/4
2/3x+23/4=-5/4x
(Multiply by 12 on both sides to get rid of fractions)
8x+69=-15x
8x=-15x-69
23x=-69
x=-3
4. Solve for y
(Choose any of the equations)
y=2/3x+7
y=2/3(-3)+7
y=-2+7
y=5
ANSWER: (-3,5)
Show all work to multiply (3+√16) (6-√64)
After the multiplication of (3+√16) (6-√64), the resultant answer is -14.
What is multiplication?Multiplying in math is the same as adding equal groups.
The number of items in the group grows as we multiply.
Parts of a multiplication issue include the product, the two factors, and the product.
The factors in the multiplication problem 6 x 9 = 54 are the numbers 6 and 9, and the product is the number 54.
So, the multiplication of:
(3+√16) (6-√64)
Now, multiply as follows:
(3+√16) (6-√64)
We know that: 3+√16 = 7
7(6-√64)
We know that: 6-√64 = -2
7(-2)
-14
Therefore, after the multiplication of (3+√16) (6-√64), the resultant answer is -14.
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HELP NEEDED ASAP THANKS
Answer:
{A) X=5} {B) X=2.75}
Step-by-step explanation:
A) (2)4x-1/2=x+7(2) - multiply each side by denominator
4x-1=x+14
-x + 1 -x +1
3x=15
÷3. ÷3
x=5
B) (2)3x+2=2x+13/2(2)
6x+2=2x+13
-2x -2. -2x -2
4x=11
÷4. ÷4
x=2.75
Answer:
x = 7.5 , x = 1
Step-by-step explanation:
(a)
[tex]\frac{4x-1}{2}[/tex] = x + 7 ( multiply both sides by 2 to clear the fraction )
4x - 1 = 2(x + 7)
4x - 1 = 2x + 14 ( subtract 2x from both sides )
2x - 1 = 14 ( add 1 to both sides )
2x = 15 ( divide both sides by 2 )
x = 7.5
(b)
3x + 2 = [tex]\frac{2x+13}{3}[/tex] ( multiply both sides by 3 to clear the fraction )
3(3x + 2) = 2x + 13
9x + 6 = 2x + 13 ( subtract 2x from both sides )
7x + 6 = 13 ( subtract 6 from both sides )
7x = 7 ( divide both sides by 7 )
x = 1
6. Jason states that -8.0 is not an integer because it has a decimal. Is he correct? Why or why not
Answer: He is incorrect.
Step-by-step explanation:
Since we are talking about -8.0, we can "ignore" the .0 because 0 has no value. An integer is a whole negative number, whole positive number, or zero. -8 is a whole negative number, since .0 means "nothing" here, so it is an integer.
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Please help me, I don't understand a thing
Answer:
Step-by-step explanation:
Let M(x,y) be the median of ΔABC through A to BC.M will be the midpoint of BC.x1=5,y1=3x2=3,y2=−1By midpoint formula, x=(x1+x2)/2∴x=(5+3)/2=8/2=4By midpoint formula, y=(y1+y2)/2∴y=(3+(−2))/2=2/2=1Hence the co-ordinates of M are (4,1).By diatnce formula, d(AM)=[(x2−x1)2+(y2−y1)2]x1=7,y1=−3x2=4,y2=1
A line make an alpha beta and delta with four diagonal of a cube. A) Find direction ratio of any two diagonal in vector form. B) Find angle between two diagonal of a cube. C) Prove that: co quare alpha co quare beta co quare gamma co quare delta = 4/3
B) direction ratio of any two diagonals in vector form is 60°.
C) cos²α+cos²β+cos²γ+cos²δ= [tex]\frac{4}{3}[/tex]
In Euclidean geometry, a perspective is a parent created by rays, often referred to as the angle's perimeters, sharing a single endpoint known as the perspective's vertex. Angles created by rays are located in the plane that contains the rays. Angles can also be created by intersecting two planes. They are referred to as dihedral angles. Curves that cross may also define an angle, which is the angle formed by rays that are perpendicular to the individual curves at the point of junction.
The degree of an angle or rotation is also expressed in terms of perspective. This metric represents the relationship between a circular arc's length and radius.
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the radius of a circle is 15inches. what is the circumference of the circle? writte your answer using pie.
Answer:
circumference of the circle is= 2πr
if radius is 15 then we should put that into the formula
30π
if pie is given as 3.14 then it would be
94.2
good luck
Answer:
30 pi inches
Step-by-step explanation:
The circumference of a circle is given by
C = 2 * pi * r
C = 2 * pi * 15
C = 30 pi inches
it is desired to estimate the mean number of chocolate chips in a chocolate chip cookie. how many cookies need to be sampled to estimate the true mean number of chocolate chips per cookie to within 2 chocolate chips with 99% confidence. assume that the population standard deviation is 3.7 chocolate chips.
According to the given standard deviation, the true mean number of chocolate chips per cookie to within 2 chocolate chips with 99% confidence is 10.6
Standard deviation:
Basically, the standard deviation refers a quantity expressing by how much the members of a group differ from the mean value for the group.
Given,
It is desired to estimate the mean number of chocolate chips in a chocolate chip cookie.
Here we need to find how many cookies need to be sampled to estimate the true mean number of chocolate chips per cookie to within 2 chocolate chips with 99% confidence and assume that the population standard deviation is 3.7 chocolate chips.
From the given question we have identified the following details,
Confidence interval = 99%
Standard deviation = 3.7
So, the critical value is calculated as,
=> 1 - 0.99
=> 0.01
So, the z scores is 2.576.
Now, the formula to confidence interval is given by : -
=> 10.6 ± 2.576 (0.01)/ √3.7
=> 10.6
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A boat is heading towards a lighthouse, where Deion is watching from a vertical distance of 140 feet above the water. Deion measures an angle of depression to the boat at point AA to be 15^{\circ}
∘
. At some later time, Deion takes another measurement and finds the angle of depression to the boat (now at point BB) to be 51^{\circ}
∘
. Find the distance from point AA to point BB. Round your answer to the nearest foot if necessary.
Using trigonometric ratio, the horizontal distance from A to B is 314 feet
Trigonometric RatioTrigonometric ratios are the ratios of the length of sides of a triangle. These ratios in trigonometry relate the ratio of sides of a right triangle to the respective angle. The basic trigonometric ratios are sin, cos, and tan, namely sine, cosine, and tangent ratios. The other important trig ratios, cosec, sec, and cot, can be derived using the sin, cos, and tan respectively.
To calculate the distance from point A to point B, we can use trigonometric ratio here.
Note: We are going to add the two angles and then use the vertical distance as the adjacent side of the triangle.
Data;
Angle = 66°Adjacent = 140ftOpposite = ABUsing tangent of the angle;
Tanθ = opposite / adjacent
tan 66 = AB / 140
AB = 140 tan66
AB = 314ft
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A chunk meat weighs 8kg.After reducing it a bit a bit,it weighs 6 1/2kg. Find the percentage decrease
Answer: 18.75%
Step-by-step explanation:
To find the percentage decrease, the formula is shown below.
Plug in the values and calculate:
[tex]\frac{8-6.5}{8} *100=18.75%[/tex]
So, the chunk of meat lost 18.75% of its initial weight.
Alexander buys ice cream and oranges at the store.
• He pays a total of $34.07.
• He pays $5.65 for the ice cream.
• He buys 7 bags of oranges that each cost the same amount.
Which tape diagram could be used to represent the context if x
represents how much each bag of oranges costs?
If x represents the cost of each bag of oranges then the equation will be 7x+5.65 = 34.07 and the value of x is $4.06.
According to the question,
We have the following information:
Alexander buys ice cream and oranges at the store.
• He pays a total of $34.07.
• He pays $5.65 for the ice cream.
• He buys 7 bags of oranges that each cost the same amount.
Let's take the cost of each bag of oranges to be $x.
We have the following equation:
7x+5.65 = 34.07
Subtracting 5.65 from both sides:
7x = 34.07-5.65
7x = 28.42
x = 28.42/7
x = 4.06
Hence, if x represents the cost of each bag of oranges then the equation will be 7x+5.65 = 34.07 and the value of x is $4.06.
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Write an equation the line perpendicular to y-3=-10(x-2) with an x-intercept of (-20, 0) in slope-intercept form.
please show work as detailed as possible
Answer:
y=1/10x+2
Step-by-step explanation:
y-3=-10(x-2) This equation is in point-slope form so the slope is -10
The perpendicular slope is the negative reciprocal so 1/10.
Slope intercept form is y=mx+b
Plug in the points of the x-intercept and slope into y=mx+b
0=-20(1/10)+b
0=-2+b
b=2
y=1/10x+2
if 4 points are indicated on a line and 5 points are indicated on another line that is parallel to the first line, how many triangles can be formed whose vertices are among the 9 points?
There are 19 triangels can be formed whose vertices are among the 9 points.
A triangle is a polygon with three sides having three vertices. The angle formed inside the triangle is equal to 180 degrees. It means that the sum of the interior angles of a triangle is equal to 180°. It is a polygon having the least number of sides. In other words, a triangle is defined as a three-sided two-dimensional figure whose interior angles are equal to 180°.
In geometry, parallel lines can be defined as two lines in the same plane that are at equal distance from each other and never meet. They can be both horizontal and vertical.
From the question, we know that we have 9 point from 2 line parallel. There are 19 triangels (the same shape is not counted twice) can be formed whose vertices are among the 9 points that shown in the following picture.
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