Last week the value of an investment changed at a rate of. -$3.15 each day. after how many days was the total change in value -$12.6.

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?