Mario invited some people to a party. When the doorbell rang the first time, one of his guests arrived. When the doorbell rang the second time, three guests arrived. When the doorbell rang the third time, five guests arrived. If the guests continued to arrive in the same manner, how many guests would be at the party after ten rings?

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?

With number 11 ( show how you got the answer)

Javier bought a painting for $150. each year, the painting's value increases by a factor of 1.15. which expression gives the painting's value after 77 years?