9. The lengths of the rectangle are labeled below. Solve for a and b. 2a + 7b
20
3a - 2b
30

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.