How much sand would it take to fill a sandbox that is 15 feet long, 10 feet wide, and 2 feet high?

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?