Question

5v + 7f =28.70 if f is 2.85

Answer 1

5v+7(2.85)=28.70

5v+19.95 = 28.70

5v = 8.75

v = 1.75

Answer 2

Hey!

First, let's write the problem.
$5v+7\left(2.85\right)=28.7$
Multiply $7$ with $2.85$.
$5v+19.95=28.7$
Subtract $19.95$ from both sides.
$5v+19.95-19.95=28.7-19.95$
$5v=8.75$
Divide both sides by $5$.
$\frac{5v}{5}=\frac{8.75}{5}$
$v=1.75$

Let me know if you have any questions regarding this problem!
Thanks!
-TetraFish