Negative 22 is equal too negative 11h

Ashopper bought a watermelon a pack of napkins and some paper plates in his state there was no tax on food the tax rate on non-food items is 5% the total for the three items he bought was 825 before tags and he paid $0.19 in taxes how much did the watermelon cost

On a piece of paper graph f(x)=5•(0.4)^x

What is the first step of an indirect proof of a number that is divisible by two