Guillermo saved 25% of his paycheck last week. his paycheck was $1000. how much money did he save?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

Acarton of juice contains 64 ounces miss wilson bought six cartons of juice how many ounces of juice did she buy

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?