A polling organization took a random sample of 3,000 middle school students to determine how many have a dog. Suppose that 57% of all middle school students have a dog. If the total population of middle school students is 8 million, is the 10% condition met?

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?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1