4. Solve the equation using the quadratic formula.
4x^2+3x-10 = 0
A.x= -2, x= 1.25
B.X= -2, x= 2
C.x= -1.25, x= 2
D.x= -1.25, x= 1.25​

Answer:

False

True

True

Step-by-step explanation:

Multiplying add exponents

Divide subtract exponents

Exponent multiply exponents

The statement and reason for each equation is written below:

Multiplication law is a law of indices that governs the multiplication of variable. if they are of the same base they add up their powers.

Division law is also a law of indices that governs division of variables, and it states that for every division the  bases are equal we subtract their powers

In conclusion, The statement and reason for each equation is written above.

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Answer:

x= -2635

Step-by-step explanation:

2 - 2197 - 10 x 44 = x

2- 2197 - 440 = x

-2635 = x

Answer:

x= -2635

Step-by-step explanation:

2 - 2197 - 10 x 44 = x

2- 2197 - 440 = x

-2635 = x

(a) No, the operation * is not closed on the real numbers.

To determine closure, we need to check if for any two real numbers x and y, xy is also a real number. However, if we choose r to be any real number other than 1, the result of xy will involve a term (-ry) that may not be a real number, breaking closure.

(b) No, the operation * is not commutative.

Commutativity requires that xy = yx for all real numbers x and y. However, in this case, xy = x + y - ry, while yx = y + x - rx. Since ry and rx are not generally equal, the operation is not commutative.

(c) No, the operation * is not associative.

Associativity requires that (xy)z = x(yz) for all real numbers x, y, and z. However, if we substitute the definition of * into both sides of the equation, we get different expressions that are generally not equal. Therefore, the operation * is not associative.

(d) Yes, the operation * has an identity element.

The identity element e is a real number such that for any real number x, xe = ex = x. In this case, choosing e = 0 satisfies the identity condition, as x0 = x + 0 - r0 = x. However, not every real number has an inverse since there are values of x for which xy = e has no solution, violating the requirement for every element to have an inverse.

(e) No, (R, *) is not a group.

A group requires closure, associativity, an identity element, and every element having an inverse. Since the operation * fails to satisfy closure and does not have inverses for all real numbers, it cannot form a group.

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The profit-maximizing quantity of Bo Tex is 90 million units.

The monopoly price is 180 million euros.

The profit of Bo Tex is 8400 million euros.

a) Calculation of profit-maximizing quantity of BoTex:

In order to calculate the profit-maximizing quantity of Bo Tex, we have to differentiate the total profit function with respect to q and equate the result to zero.

Total profit (Π) = Total revenue (TR) – Total cost (TC)TR = p.

q = (360 - 2q)q = 360q - 2q2TC = 1000 + q2Π = TR - TC

Differentiating Π w.r.t. q: {d \Pi}{dq} = 360 - 4q

Equating it to zero, we get:

360 - 4q = 0q = 90 million units

Therefore, the profit-maximizing quantity of Bo Tex is 90 million units.

b) Calculation of monopoly price:

To calculate the monopoly price, we need to substitute the quantity obtained in part (a) into the inverse demand function:

pq = 360 - 2q = 360 - 2(90) = 180 million euro

Therefore, the monopoly price is 180 million euros.

c) Calculation of profit:

We have to substitute the value of quantity (90 million units) and price (180 million euros) into the total revenue and total cost functions.

Total revenue (TR) = p.q = 180 × 90 = 16,200 million euro

Total cost (TC) = 1000 + q2 = 1000 + 902 = 8200 million euro

Profit (Π) = TR - TC = 16,200 - 8200 = 8400 million euro

Therefore, the profit of Bo Tex is 8400 million euros.

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To determine the number of headphones that must be sold to maximize profit and the maximum profit, we can analyze the profit function P(x) = -0.02x² + 44x - 1750. The number of headphones sold to maximize profit is 1100, and the maximum profit is $17,050.

(a) To find the number of headphones that maximize profit, we need to identify the x-value at which the profit function reaches its maximum. The maximum point occurs at the vertex of the quadratic function. The x-coordinate of the vertex can be found using the formula x = -b / (2a), wherea and b are the coefficients of the quadratic function. In this case, a = -0.02 and b = 44. Plugging these values into the formula, we find x = -44 / (2 * -0.02) = 1100. Therefore, 1100 headphones must be sold to maximize profit.
(b) To calculate the maximum profit, we substitute the value of x = 1100 into the profit function P(x). P(1100) = -0.02(1100)² + 44(1100) - 1750 = -24200 + 48400 - 1750 = 17050. Hence, the maximum profit is $17,050.
In conclusion, in order to maximize profit, 1100 headphones must be sold, resulting in a maximum profit of $17,050.

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Answer:

i think its 102 or 120-18

Step-by-step explanation:

i think cauee 10% of 120 is 12 and half of ten percent is 5 and 5% is 6

Answer:

she will save $18

Step-by-step explanation:

find 10% of the number. then find 5%. add the two answers together and you get $18.

10% of $120 = $12

5% of $120 = $6. (half 10%)

$12 + $6 = $ 18

The error terms are heteroskedastic

Suppose that the individuals are divided into groups j = 1, ...,J each with nj observations respectively, and we only observe the reported group means y; and īj.

The model becomes y; = Ba; +ūj, with error terms ū; = ; Uij, where Ui; indicates error term ui of individual i belonging to group j.

Now we have to demonstrate that the error terms ūj are heteroskedastic.

The model becomes: y; = Ba; + ūj;

For each group j, the estimated variance of the error term is given by the sum of squared deviations divided by the sample size, and we can write it as follows:

S_j^2 = sum ( yij - īj )^2 / ( nj - 1 ) where yij denotes the observation for the ith individual in the jth group.

The variance of the error term is therefore different for each group j. In other words, the error terms ūj are heteroskedastic.

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The code segment will print the characters 'a', 'e', and 'i' on separate lines.

The code segment appears to be part of a loop structure, which is likely iterating over a collection of characters. Each character is printed on a new line using the '.println()' function. The loop is not provided in the given code segment, so it's unclear how the characters are being generated or selected. However, assuming that the loop iterates over the characters 'a', 'e', and 'i', the output will be as follows:

a

e

i

The code uses the '.println()' function, which adds a line break after each character is printed. As a result, each character will be displayed on a separate line. The lack of surrounding code or context prevents a more specific explanation, but based on the given information, we can conclude that executing this code segment would output the characters 'a', 'e', and 'i' on separate lines.

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Answer:

7. 78

8. 169

Step-by-step explanation:

Answer:

5

Step-by-step explanation:

Complete question :

At a certain bus station, 47% of all arrivals are late. Suppose a random

sample of 12 bus arrivals is examined. Using the binomial function, give the probability of ;

Atleast 8 late arrivals 2) At most 4 late arrivals

Answer:

P(x >= 8) = 0.1411 ;

P(x ≤ 4) = 0.2570

Step-by-step explanation:

Using the binomial probability distribution relation :

P(x =x) = nCx * p^x * (1 - p)^(n - x)

p = 47% = 0.47

1 - p = 0.53

n = 12

A.)

Atleast 8 late arrivals

P(x >= 8) :p(x = 8)+p(x =9)+p(x=10)+p(x=11)+p(x=12)

Using a binomial distribution calculator to save computation time :

P(x >= 8) = 0.141096

P(x >= 8) = 0.1411

B.)

P(x ≤ 4) = p(x=0)+p(x=1)+p(x=2)+p(x=3)+p(x=4)

Using a binomial probability calculator ;

P(x ≤ 4) = 0.25697

P(x ≤ 4) = 0.2570

Answer:

82°

Step-by-step explanation:

(8x-7)=(x+16)

x+16+x=180

2x+16=180

2x=180-16

2x=164

2x/2=164/2

x=82°

Answer:

Answer is 0

Step-by-step explanation:

-6x-6=x²-5x-6

-6(x+1)=(x+1)(x-6)

-6=x-6

x=0

Answer:

WOAH!!!!

Step-by-step explanation:

Thx for sharing that!

Mark as brainlist plssss.

Answer:

Wow

Step-by-step explanation:

Answer:Yes

Step-by-step explanation:

Answer:

100

Step-by-step explanation:

130 - 30 = 100

Answer:

Step-by-step explanation:

Use the Pythagorean Theorem. The hypotenuse, 14  square should be equal to the sum of x squared + 10 squared.

14^2 = 196

10^2 = 100.

So, 196 = 100 + x^2

[tex]x = \sqrt{96}[/tex]  

Answer:

cherry street is 85 yards, while orange dr. and peach ave. is 113 yards, meaning that cherry st. is 28 yards faster

Step-by-step explanation:

85 x 85) - (77 - 77) = 1296

square root of 1296 is 36

77 + 36 = 113

113 - 85 = 28

this means that cherry st. is 28 yds faster

using the Pythagorean Theorum

hope i helped

-lvr

Answer:

Let’s use the formula for the probability of the complement of an event: P(A') = 1 - P(A), where A is the event and A' is the complement of the event. In this case, the event A is selecting a park that either allows camping or has a playground. The complement of this event, A', is selecting a park that neither allows camping nor has a playground. We can use the formula for the probability of the union of two events to find P(A): P(A ∪ B) = P(A) + P(B) - P(A ∩ B), where A and B are two events and A ∩ B is the intersection of the two events. Let’s let event C represent selecting a park that allows camping and event P represent selecting a park that has a playground. Then, we have: P(C ∪ P) = P(C) + P(P) - P(C ∩ P) The probability of each event is equal to the number of parks with that characteristic divided by the total number of parks. We are given that there are 40 parks that allow camping, 107 parks that have playgrounds, and 32 parks that both allow camping and have playgrounds. The country has a total of 252 parks. So we have: P(C) = 40/252 P(P) = 107/252 P(C ∩ P) = 32/252 Substituting these values into our formula for P(C ∪ P), we get: P(C ∪ P) = (40/252) + (107/252) - (32/252) = (40 + 107 - 32)/252 = 115/252 Now we can use our formula for the probability of the complement of an event to find P(A'): P(A') = 1 - P(A) = 1 - P(C ∪ P) = 1 - (115/252) = (252/252) - (115/252) = (252 - 115)/252 = **137/252** So the probability of randomly selecting a park that neither allows camping nor has a playground is 137/252.

Step-by-step explanation:

Answer:

Ermm, hey Vivi, give me a sec

Step-by-step explanation:

To find the probability of randomly selecting a park that neither allows camping nor has a playground, we need to determine the number of parks that fit this criteria and divide it by the total number of parks.

Let's denote:

A = Number of parks that allow camping (40)

B = Number of parks that have a playground (107)

C = Number of parks that both allow camping and have a playground (32)

T = Total number of parks (252)

To find the number of parks that neither allow camping nor have a playground, we can use the principle of inclusion-exclusion:

Number of parks that neither allow camping nor have a playground = T - (A + B - C)

Substituting the given values, we have:

Number of parks that neither allow camping nor have a playground = 252 - (40 + 107 - 32)

= 252 - 147

= 105

Therefore, there are 105 parks that neither allow camping nor have a playground.

To calculate the probability, we divide this number by the total number of parks:

Probability = Number of parks that neither allow camping nor have a playground / Total number of parks

= 105 / 252

The probability of randomly selecting a park that neither allows camping nor has a playground is 105/252.

Answer:

Max height: 64 feet, and the socond one was higher.

Step-by-step explanation:

The max height is the y value of the vertex, because that’s when the graph peaks.

we can already very clearly see the vertex on the graph, so we don’t need to calculate it.

the max height of the second golf ball is 64 feet.

Now let’s look at the max height on the first golf ball.

we get the equation

h=-16t squared + 48t

to find the vertex of this, we can use the formula -b/2a

-48/-32 = 1.5

1.5 is the t value of this vertex.

to find the h value, we plug it in.

h = -16 (1.5) squared + 48(1.5)

h =2.25 times -16 + 72

h = -36 +72

h = 36

the first one is 36 max height, and the second is 64. The second one is bigger.

Answer:

41

Step-by-step explanation:

Its correct ^^

a) The  scatter diagram is shown below.

b) The estimated regression equation for the given data is given as [tex]y = 5.47 + 1.18x[/tex].

c) When x = 6, the estimated value of y is approximately 12.65.

d) T

e) The sample correlation coefficient is approximately 0.8107.

f) In this case, the standard error of the estimate is approximately 5.10.

g) Without these details, it is not possible to conduct the t-test.

Scatter diagram is a visual representation of data points plotted on a Cartesian coordinate system. It is used to display the relationship between two variables.

a) To develop a scatter diagram, plot the given data points (xi, yi) on a graph, where xi represents the values of the independent variable and yi represents the values of the dependent variable. The  scatter diagram is shown below.

b) To develop the estimated regression equation, we need to find the equation of the line that best fits the data points. This line represents the relationship between the independent variable (x) and the dependent variable (y). The estimated regression equation is given by:

y = a + bx

where "a" represents the y-intercept and "b" represents the slope of the line.

Using statistical methods such as least squares regression, the estimated regression equation can be calculated. In this case, the estimated regression equation is:

y = 5.47 + 1.18x

c) To predict the value of y when x = 6, substitute x = 6 into the estimated regression equation:

y = 5.47 + 1.18(6)

y = 12.65

Therefore, when x = 6, the estimated value of y is approximately 12.65.

d) The percentage of the total sum of squares accounted for by the estimated regression equation is given by the coefficient of determination (R-squared). It represents the proportion of the total variation in the dependent variable (y) that can be explained by the independent variable (x) through the estimated regression equation.

In this case, the coefficient of determination (R-squared) is 0.6563, or approximately 65.63%. This means that the estimated regression equation can account for about 65.63% of the total variation in the dependent variable.

e) The sample correlation coefficient (r) measures the strength and direction of the linear relationship between the two variables. In this case, the sample correlation coefficient is approximately 0.8107, indicating a strong positive linear relationship between the variables.

f) The standard error of the estimate measures the average distance between the observed data points and the predicted values from the regression equation. In this case, the standard error of the estimate is approximately 5.10.

g) To test for a significant relationship using the t-test, you would need additional information such as the sample size and the significance level (α) specified in the question. Without these details, it is not possible to conduct the t-test.

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Answer:

about 40 cm.

Step-by-step explanation:

I know the length of the third side is 40cm because I used the Pythagorean theorem.

a^2+b^2=c^2 The "a" and "b" values are the lengths of the legs of the triangle, while "c" is the length of the hypotenuse. We know the third side of this triangle is not the hypotenuse.

* The longest side of a right triangle is the hypotenuse, so we know the length of the hypotenuse is 46cm.

Therefore, we plug our values into the Pythagorean theorem.

23^2+b^2=46^2

529+b^2=2116

Next, we subtract 529 on both sides.

b^2=1587

Next, find the square root of 1587, so we can find the true value of b.

b=39.8371685741

Rounded to the nearest centimeter is 40.

In conclusion, the length of the third side is 40cm.

Answer:

Similar by: SAS

ΔPKM ~ ΔLQM

Yes, the triangles PMK and LMQ are similar by SAS similarity statement.

A triangle is a three-sided polygon that consists of three edges and three vertices.

Two triangles are said to be similar if their corresponding angles are congruent and the corresponding sides are in proportion .

The triangles PKM and triangle LMQ are the similar triangles.

If two sides and the included angle in one triangle are congruent to two sides and the included angle in another triangle, then the two triangles are congruent

Both the triangles have a common angle M and two sides are proportional

∠LMQ = ∠PMK

The sides are proportional

LM/PM = QM/KM

The triangles are similar

ΔPKM ~ ΔLQM

Hence, Yes the triangles PMK and LMQ are similar by SAS similarity statement.

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Answer:

$2,550.20

Step-by-step explanation:

just took the test and got it right!

Answer:

90 degrees

Step-by-step explanation:

The three angles of a triangle always add up to 180 degrees, so knowing this, all three of the measures given should add up to 180.

First, you need to solve for x:

S(x+10) + R(2x+60) + T(50+x) = 180

Add up all of the like terms:

10 + 60 + 50 = 120

x + 2x + x = 4x

So now you are left with 4x + 120 = 180

And solve for x:

4x/4 + 120/4 = 180/4

x + 30 = 45

x + 30-30 = 45-30

x = 15

Now that we have the value of x, plug it into the measure given for angle R:

(2x+60)

= (2(15)+60)

= (30 + 60)

= 90

So the measure of angle R is 90 degrees.

I hope this helped! :)

Answer:

sine=opposite/hypotenuse

sine=6/10

sine=0.6

sine^-1 0.6

=36.87

Answer:

C - 18 pi

Step-by-step explanation:

edge

Answer:

5/18

108

A sector has an area of 30π in.2. The radii containing the sector form an angle of 100°. What is the area of the circle?

The ratio of the angle of the sector to the entire circle is

✔ 5/18

.

Area of the sector = StartFraction n degrees over 360 degrees EndFraction (pi) (r squared). 30 pi = StartFraction 100 degrees over 360 degrees EndFraction (pi) (r squared). (StartFraction 18 over 5 EndFraction) 30 pi = (pi) r squared.

The area of the entire circle is

✔ 108

Pi in.2