What number balances this equation? 24+(3+6) = (24+3)+_

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Pam buys a sleeve of ball bearings for her skateboard. each of the bearings is 1 1/5 inches wide. the sleeve is 9 3/5 inches long. how many ball bearings are in the sleeve? show your work.

Arecipe uses 2 cups of sugar to make 32 brownies. how many cups of sugar are needed to make 72 brownies?