Find the volume of the cylinder. Round your answer to the nearest tenth.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

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?

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.