6.Write an equation and solve: A plumber charges $45 plus $39.75 per hour of service. Miguel's bill was $164.25. Write and solve an equation to find how many hours of service the plumber charged?

Three coins are flipped. what is the probability that there will be at least two tails?

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a