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Mamont248 [21]
3 years ago
11

7r + 2 - 3r = -2 plsss

Mathematics
1 answer:
KonstantinChe [14]3 years ago
8 0

Answer:

Combine like terms

4r+2=-2

Subtract 2 from both sides

4r=-4

Divide 4 by from both sides

r=-1

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The ratio of boys to girls in a class room is 5 to 7. If there are 30 boys then how many girls are there
Brums [2.3K]

Answer:

The ratio of boys to girls to 5:7

Let the number of boys be 5x

Let the number of girls be 7x

5x = 30

x = 6

Now just plug in 6 for the x in 7x

and number of girls 7 x 6 = 42

4 0
3 years ago
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Kendall is making greeting cards, which she will sell by the box at an arts fair. She paid $40
natta225 [31]

Answer:

9

Step-by-step explanation:

40 dollars due up front

10 dollars made per sale

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Realistically speaking she is only making a $5 profit per box she sells;

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<em>40/5 = 9</em>

5 0
3 years ago
Type your answers into the boxes.
egoroff_w [7]

Answer:

Step-by-step explanation:

√121 = 11

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6 0
3 years ago
For the function shown below, find f(3): f(x)=2x^4-8x^2+5x-7
a_sh-v [17]

We have been given the function

f(x)=2x^4-8x^2+5x-7

We have to find the value of f(3). In order to find the same, substitute x=3 in the given function.

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Now, we simplify this step by step.

First of all 3^4=81\text{ and }3^2=9. Thus, we have

f(3)=2\times 81 -8\times 9+5(3)-7

Now, we can easily simplify it by PEMDAS

f(3)=162-72+15-7

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3 0
3 years ago
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grigory [225]
50mph hope it helps good luck
6 0
3 years ago
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