A small tree was planted at a height of 8 feet. The tree has been planted for 15 months, and is now 57.5 feet tall. Which equation could be used to find x, the average number of feet the tree grew each month? A.
15x + 8 = 57.5

B.
15x + 57.5 = 8

C.
8x + 15 = 57.5

D.
57.5x + 8 = 15

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?