Hi I need help with this please.

Math 137 Quiz 5 Name 1. A phone service charges a flat fee plus a charge per minute of usage. If the number of minutes of usage is 80, the bill is $39.60. If the number of minutes of usage is 120, the bill is $44.40. (a) Determine an equation for the charges y as a function of the number x of minutes of usage. (b) If the bill is $48, determine the number of minutes of usage. 2. A server at a restaurant had the following tips (y) for different check amounts (x). 15.40 2.00 22.35 3.50 27.50 4.00 31.25 4.75 35.60 6.00 40 25 7.00 (a) Draw a scatterplot (b) Determine the equation of the line of least squares (line of regression) to fit these points. (c) Find the predicted tip for a check amount of $50 Quiz continues 3. A hot air balloon is released from the top of a building that is 70 fi high. The balloon rises at a constant rate. After 5 seconds, the height of the balloon is 100 ft. Time : Height 70 100 (a) Find an equation that gives the height of the balloon since the time of its release. (b) Determine the height of the balloon 15 seconds after its release. (c) How long does it take for the balloon to reach a height of 150 fi