Hannah pays $39 per month for her cellular phone which includes 1 hour of use. After the first hour, she pays 20% per minute. How much will her monthly bill be
if she uses her phone 2.5 hours?

An energy plant is looking into putting in a system to remove harmful pollutants from its emissions going into earth's atmosphere. the cost of removing the pollutants can be modeled using the function c = 25000p/100 -p what is the vertical asymptote?

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?