Fast robert has $18 to spend on ring tones for his new cell phone. each ring tone costs $1.95 to download. by rounding the cost of the ring tones to the nearest whole dollar, estimate the number of tones he can download.

a. 7

b. 9

c. 11

d. 13

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

Adozen bananas weigh 3 pounds how many ounces does 1 banana weigh

Define multiplicative inverse. give an example of a number and its multiplicative inverse.