3x-9=3(x-3) how many solutions

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

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?

10x − 5y + 14 = 0 whats the answer pls