Find the HCF of a²+7a+12

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?

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?