Evaluate using the order of operations -5(1-4)^2+18

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Aline passes through 3,7 and 6,9 what equation represents the line

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g