How to find the percent when they already give you the answer. for example: _% of 40=15 what would the answer be and how do you find it out

Determine the volume of a cylinder bucket if the diameter is 8.5 in. and the height is 11.5 in.

Are the corresponding angles congruent? explain why or why not.

Tatiana wants to give friendship bracelets to her 32 classmates. she already has 5 bracelets, and she can buy more bracelets in packages of 4. write an inequality to determine the number of packages, p, tatiana could buy to have enough bracelets.