I NEED THIS ASAP A gym charges its members a one-time $20.00 sign-up fee, and $25.00 per month. The function rule f(x) = 25x + 20 describes the relationship between the number of months x, and the total cost of membership f(x). If a gym member paid $170.00, for how many months did the gym member pay?

A. 4 months
B. 5 months
C. 6 months
D. 7 months

Solve the system of equations. y= 2x y= x^2 - 15

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?