Sally can paint a room in 99 hours while it takes steve 44 hours to paint the same room. how long would it take them to paint the room if they worked together

How do you use the elimination method for this question? explain, because i really want to understand!

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?

Determine domain and range, largest open interval, and intervals which function is continuous.