By selling old cds, sarah has a store credit for $153. a new cd costs $18. what are the possible numbers of new cds sarah can buy?

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years

When solving a logarithm equation, how do you find the missing variable ?