How do i write 4x 5 - 16x 2 + 13x8

Pls! does anybody know a shortcut for answering these types of questions in the future?

Acompany produces packets of soap powder labeled “giant size 32 ounces.” the actual weight of soap powder in such a box has a normal distribution with a mean of 33 oz and a standard deviation of 0.7 oz. to avoid having dissatisfied customers, the company says a box of soap is considered underweight if it weighs less than 32 oz. to avoid losing money, it labels the top 5% (the heaviest 5%) overweight. how heavy does a box have to be for it to be labeled overweight?

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?