Which expression is equivalent to x-6?
a.) x1 – x7
b.)x-2 • x3
c.)x-2 + x-4
d.)x-3 • x-3

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

I’m stuck on this equation, anyone got the answer?

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no. explain your mathematical thinking