A window washer cleaned 38 windows in 2 hours. At this rate, how many windows did he clean in 7 hours?

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

What numbers are included in the set of integers? what numbers are not included?

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?