30/150 = 80/x
Reduce the fraction:
1/5 = 80/x
Cross multiply:
x = 5 x 80
x= 400
Answer: 400 zebras.
6
Like how

= 36
Square root does the opposite.
Edit: my mistake, it is 6
Y=2100 because you plug in 0 for x. Then you plug in your y value in the equation and solve
$24 if it is at the beginning of the day and he is left with $11, and if he spent $13, then 11+13=24