i don't understand. i'm so bad at math and everyone else is so good at it. my brother can do like anything in math and i cant do anything. i feel so st upid and i know i'm gonna fail the 7th grade. i just don't understand why i couldn't be smart :(

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Ateam of runners is needed to run a 1 2 -mile relay race. if each runner must run 1 4 mile, how many runners will be needed?

Someone me! will award brainliest if u explain and answer!