Which number is the opposite of -15

Prove that 3: 8 is equivalent to 12: 32.a. use diagrams to support your answer.

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

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