12. Using the function given R(t) = .4t − 20 cos(π t / 45) + 40 , write and evaluate an expression to find the exact value for the total number of gallons of gasoline that the airplane consumes over the first ninety minutes of the flight. Show your work.

Question

12.	Using the function given R(t) = .4t − 20 cos(π t / 45) + 40 , write and evaluate an expression to find the exact value for the total number of gallons of gasoline that the airplane consumes over the first ninety minutes of the flight. Show your work.

kkutie7 · Answer

t	0	15	30	45	60	75	90
R(t)	20	35	63	78	73	60	56

kkutie7 · Answer

this also goes with it. Determine the average rate of fuel consumption for the ninety minute flight.

kkutie7 · Answer

answer to the first part in 1980.... I still don't get the next part.