Given:
The equation is

To find:
The slope intercept form of the given equation.
Solution:
The slope intercept form of a linear equation is

Where, m is slope and b is the y-intercept.
We have,

We need to isolate y. Add 10x on both sides.


Divide both sides by 20.




Therefore, the slope intercept form of the given equation is
.
4000. You need to round it to the nearest thousand, which would be the 4 at the start if you break it down into its units. Where from right to left, you have, 1s, 10s, 100s and 1000s. Meaning you need to keep the first digit (unless the hundreds are 500+) and everything after should just be the thousands.
It is 784 cubic inches so you are right
B: 3 & 9
They are the smallest numbers but three still fits into both of them