Write a situation to represent y=5x

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.

2f(x)= x+3 if 4 < x < 8 2x if x 28 2