"The sum of two numbers is 20" can be translated mathematically into the equation:
x + y = 20.
"... and their difference is 10" can be translated mathematically as:
x - y = 10
We can now find the two unknown numbers, x and y, because we now have a system of two equations in two unknowns, x and y. We'll use the Addition-Subtraction Method, also know as the Elimination Method, to solve this system of equations for x and y by first eliminating one of the variables, y, by adding the second equation to the first equation to get a third equation in just one unknown, x, as follows:
Adding the two equations will eliminate the variable y:
x + y = 20
x - y = 10
-----------
2x + 0 = 30
2x = 30
(2x)/2 = 30/2
(2/2)x = 15
(1)x = 15
x = 15
Now, substitute x = 15 back into one of the two original equations. Let's use the equation showing the sum of x and y as follows (Note: We could have used the other equation instead):
x + y = 20
15 + y = 20
15 - 15 + y = 20 - 15
0 + y = 5
y = 5
CHECK:
In order for x = 15 and y = 5 to be the solution to our original system of two linear equations in two unknowns, x and y, this pair of numbers must satisfy BOTH equations as follows:
x + y = 20 x - y = 10
15 + 5 = 20 15 - 5 = 10
20 = 20 10 = 10
Therefore, x = 15 and y = 5 is indeed the solution to our original system of two linear equations in two unknowns, x and y, and the product of the two numbers x = 15 and y = 5 is:
xy = 15(5)
xy = 75
Selena's dog completed an obstacle course that was 452 meters long. There were four parts to the course, all equal length. How long was each part of the course?
Answer:
113 meters long
Step-by-step explanation:
If each part is all equal in length, then each part is 1/4 the total length of the obstacle course. Therefore, each part of the course was 1/4(452)=113 meters long
In triangle ABC, m
15
1353
25
the domain and range of the given set of points?
(0,8) (-5,-8) (9,1) (0,0) (-6-7)
Answer:
Domain: -6,-5,0,0,9
Range:-8,-7,0,1,8
Step-by-step explanation:
Then find the values of x and y?
Answer:
x=76
Step-by-step explanation:
y+8=3y
-2y=-8
y=4
104*2=208
360-208=152
152/2=76
x=76
Simplify: x^1/3( x^1/2 + 2x^2)
Answer:
Step-by-step explanation:
x^1/3( x^1/2 + 2x^2)
x^(1/2 + 1/3) + 2x^(2 + 1/3)
x^(5/6) + 2x^(7/3)
Need help please
What is the measure of angle 1?
What is the measure of angle 3?
What is the measure of angle 6?
Answer:
Step-by-step explanation:
Do you have any measurements?
1) 180-Angle 2 = Angle 1
3) Same as Angle 2
6) Same as Angle 2
A box of toy cars contains blue, orange, yellow, red, and black
cars. A separate box contains a male and a female action
figure. What is the probability of randomly choosing an orange
car and a female action figure? Is it likely or unlikely that this
combination is chosen?
Answer:
Step-by-step explanation:
Select the correct answer.
What is the value of this expression if h = 8, j = -1, and k
= -12?
А. 3
B
12
C.
36
D
-12
PLEASE HELP ME
Answer:
the answer is B so it's 12
Write the slope-intercept form of the equation of the line.
9514 1404 393
Answer:
y = x + 2
Step-by-step explanation:
We observe that the line crosses the y-axis at y=2, so the y-intercept is 2.
The line has a rise of 1 grid square for each run of 1 grid square to the right. The slope is the ratio of rise to run:
m = rise/run = 1/1 = 1
The slope and intercept can be put into the slope-intercept form:
y = mx + b . . . . . line with slope m and y-intercept b
y = 1x +2 . . . . . . line with slope 1 and y-intercept 2
y = x +2 . . . . . . . simplified
5x+3x+2y+4y (simplify)
Answer:
Combine like terms:
(5x + 3x) (2y + 4y)
8x + 6y is your algebra expression.
What is the value of y
Answer:
85 i thinkkkk
Step-by-step explanation:
Plz help me well mark brainliest if correct!!.....
Answer:
12 inches
Step-by-step explanation:
All you have to do is divide 72 by 6.
72 divided by 6 equals 12.
So your answer would be D.12 inches
Solve for 41.
1259
61 = [?]
61
37°
889
Answer: 55
Step-by-step explanation:
180 = 125 + x
x = 55
What is the rule for the number pattern below ?950,800,650,500,350
Drag each solution to the correct location on the table. Each solution can be used more than once, but not all solutions will be used.
Determine the solutions to each of the given quadratic equations.
(3x + 8)(3x + 8) = 0
(3x-8)(3x + 8) = 0
x(3x - 8) = 0
(3x-8)(3x - 8) = 0
= -8
Answer:
The answers to your questions are given below.
Step-by-step explanation:
1. (3x + 8)(3x + 8) = 0
3x + 8 = 0 or 3x + 8 = 0
3x = –8 or 3x = –8
x = –8/3 or –8/3
2. (3x – 8)(3x + 8) = 0
3x – 8 = 0 or 3x + 8 = 0
3x = 8 or 3x = –8
x = 8/3 or –8/3
3. x(3x – 8) = 0
x = 0 or 3x – 8 = 0
x = 0 or 3x = 8
x = 0 or 8/3
4. (3x – 8)(3x – 8) = 0
3x – 8 = 0 or 3x – 8 = 0
3x = 8 or 3x = 8
x = 8/3 or 8/3
What is the volume of a sphere with a diameter of 49.3 cm, rounded to the nearest
tenth of a cubic centimeter?
Answer:
62739.3 cm3
Step-by-step explanation:
Volume of a Sphere:
V=43πr3V=\frac{4}{3}\pi r^3V=34πr3
radius=diameter2=49.32=24.65\text{radius} = \frac{\text{diameter}}{2} = \frac{49.3}{2}=24.65radius=2diameter=249.3=24.65
centimeters
Plug in:\text{Plug in:}Plug in:
43π(24.65)3\frac{4}{3}\pi (24.65)^334π(24.65)3
62739.258293562739.258293562739.2582935
Use calculator
≈62739.3 cm3\approx 62739.3\text{ cm}^3≈62739.3 cm3
Round to the nearest tenth
No random answers or links, please.
Answer:
the ans is 4 hope it may help u
Step-by-step explanation:
x =-6
x= - × -6 -2
x=+ 6 -2
x= +4
Suppose you deposit $1500 in a savings account that pays interest at an annual rate of 3.5%. Non money is added or withdrawn from the account. How much will be in the account after 5 years? How much will be in the account after 20 years?
Answer:
5 years : 1781.52
20 years: 2984.68
URGENT NEED HELP CLICK TO SEE
Answer:
A
Step-by-step explanation:
It’s a
Answer:
c
Step-by-step explanation
the higher the negative number, the less it is worth. therefore -26 is less than -5, which is less than 17
Which is the simplified form of the expression?
10n−13(9n−12)
7n + 4
7n – 4
3n + 4
3n – 12
Given:
Consider the given expression is:
[tex]10n-\dfrac{1}{3}(9n-12)[/tex]
To find:
The simplified form of the given expression.
Solution:
We have,
[tex]10n-\dfrac{1}{3}(9n-12)[/tex]
Using distributive property, it can be written as:
[tex]=10n-\dfrac{1}{3}(9n)-\dfrac{1}{3}(-12)[/tex]
[tex]=10n-3n+4[/tex]
[tex]=7n+4[/tex]
Therefore, the correct option is A.
pweeze help Use the following net to find the surface area of the solid figure it represents.
144 yd 2
48 yd 2
88 yd 2
94 yd 2
Answer:
The correct answer is 48
Step-by-step explanation:
Last year a farm produced 6.2 - 10^6soybeans and 7.8. 10^6 onions.
a.) What was the total number of vegetables produced by the farm last year?
Answer:
Yessir
Step-by-step explanation:
Angle Relationships
Determine the height of the triangle. Round to the nearest foot.
a. 12 ft
b. 14 ft
c. 10 ft
d. 18 ft
Please select the best answer from the choices provided
Answer:
B. 14 ft
Step-by-step explanation:
I calculated it logically
The slope of the line in the graph is 4. Fill in the y intercept. Choose the correct equation in the form y = mx + b The y intercept is: The equation is y =
Answer:
[tex]\rm\implies y = 4x + 3 [/tex]
Step-by-step explanation:
Given :-
The slope of the line in the graph is 4.And we need to find the equation of the line. On looking at the graph we see that , it cuts y axis at (0,3) .So the y Intercept of the equation is 3 .
Slope Intercept Form :-
[tex]\rm\implies y = mx + c[/tex]
Substituting the respective values :-
[tex]\rm\implies y = 4*x + 3 \\\\\rm\implies y = 4x + 3 [/tex]
Hence the equation of line is y = 4x + 3
The diameter of a dime is 17.91 millimeters, an the height is 1.35 millimeters. What is the volume of a dime? What is the volume of an oblique cylinder formed by stacking 50 dimes? Round your answers to the nearest hundredth.
Answer:
why does no one ever answer these questionsss?? it's always math to, like I'm just trying to pass my quick check, let alone the class. you know how much easier my life would be it's people just answered the questions. I'm gonna run away, to some Scottish Isle and live a quiet life, in a cozy home with the wind outside ruffling through the grass, and the tired tired sea crashing onto the shoreline. I'll only visit my family and friends once a year, but the rest of the time, I'll be there, in the quiet. eventually a young visitor will stumble through my b & b and he'll end up staying there for weeks, for reasons unknown to me. Then, we'll fall in love, to the quiet sound of the ocean outside. And it'll be just us, it'll be our place, our secret. we won't have to deal with the loud, crazy, hectic world. and it will be perfect. but for now I'm stuck trying to pass this math class.
Answer:
The volume of one dime is 340.11 mm3. The volume of 50 dimes is 17.005.32 mm3.
Step-by-step explanation:
Two planes start from the same point and fly opposite directions. The first plane is flying 20 mph slower than the second plane in 2 h the planes are 540 mi apart. Find the rate of each plane
Answer:
This
Step-by-step explanation:
let x = rate of the slower plane (First plane!)
x+25 = rate of the faster plane (Second plane!)
The planes fly for 2 hours, where Distance = R*T
Distance between the planes = SUM of the distances.
R*T + R*T= 470 miles
2*x + 2*(x+25)=470
2x+2x + 50 = 470
4x+50=470
4x=420
x=105 mph First plane
x+25= 105+25=130 mph Second plane.
Answer:
4x+50=470
4x=420
x=105 mph First plane
x+25= 105+25=130 mph Second plane.
R^2
Step-by-step explanation:
5y - 2y = 3y + 2
please help.
Jim is twice as old as chin and four times as old as di.Their total ages altogether is equal to 84 years.Calculate jim's age
Answer:
48 years
Step-by-step explanation:
Let the ratio of their ages be
4:2:1
Sum up the numbers
4+2+1
= 7
Their total ages is 84
7/84
= 1/12
Therefore Jim age can be calculated as follows
= 12×4
= 48
Hence Jim is 48 years
Multiplying polynomials
(4x+3y)(5x+y)
Answer:
20x^2 +19xy+3y^2
Step-by-step explanation:
See Image below :)
9514 1404 393
Answer:
20x² +19xy +3y²
Step-by-step explanation:
Use the distributive property.
(4x +3y)(5x +y)
= 4x(5x +y) +3y(5x +y)
= 20x² +4xy +15xy +3y²
Collect terms.
= 20x² +19xy +3y²
Using Cavalieri's Principle, what is the general formula for the volume of a cone?
Answer:
The volume for a cone and pyramid are the same, V = 1/3 Bh where B is the area of the base.
Step-by-step explanation:
So even though the base is a different shape, as long as the areas and heights are the same, they will have the same volume.