How do you solve 3x+9y=-7

Part a : solve -vp + 40 < 65 for v part b : solve 7w - 3r = 15 for r show your work .

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?

Find the missing dimension! need asap! tiny square is a =3025 in ²