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Arada [10]
3 years ago
12

What is the solution? 21=42−3r A r=−8 B r=−7 C r = 7 D r = 8

Mathematics
2 answers:
valentina_108 [34]3 years ago
8 0
C. R = 7. 3x7= 21-42=21
g100num [7]3 years ago
4 0

Answer:

C r=7

Step-by-step explanation:

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Ryan has 50 cookies if he wants to buys x amount of 16 cookies, how many cookies will he have c= cookies
7 0
2 years ago
If x varies directly with y and x = 3.5 when y = 14, find x when y = 18.
maks197457 [2]

Answer:

x = 4.5

Step-by-step explanation:

there's definitely other ways to solve this, but I used a proportion.

\frac{3.5}{x} = \frac{14}{18}

Then you can make this equation:

14x = 3.5 * 18

I solved for it and got 4.5 .

5 0
3 years ago
Help me find x it’s really hard
Vilka [71]

Answer:

x = 140

Step-by-step explanation:

180 - 65 - 75= 40

180 - 40 = x

140 = x

3 0
3 years ago
What is the y-coordinate of the solution for the system of equations? x−y=−11 y+7=−2x
ICE Princess25 [194]

Answer:

y= 5

Step-by-step explanation:

Given the system of equations:

x-y=-11

y+7=-2x

In order to find the y coordinate of the solution we must first find the solution to this system of equations. We first start by solving one of the given equations and then substitute the answer of that into the second equation and further solve to get the final answers.

x=y=-11

y+7=-2x

y+7=-2x

+ -7

y = -2x - 7

x - y = -11

y = -2x-7

x-(-2x-7)=-11

x--2x=x+2x=3x

3x+7=-11

-7

-11+-7=-18

3x=-18

\div3

-18\div3=-6

x=-6

y=-2x-7

y=(-2)(-6)-7

-2\times-6=12-7=5

y=5

Hope this helps.

7 0
2 years ago
If one gallon of paint covers 825 sq. ft., how much paint is needed to cover 2640 sq. ft.
Ray Of Light [21]
3.2 gallons of paint is needed since 2640 divided by 825 = 3.2 
6 0
3 years ago
Read 2 more answers
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