10 points
The graph shows the relationship between the number of gallons of fuel remaining in the
tank of a semitruck and the number of miles traveled by the semitruck.
Semitruck Fuel
HITI
Number of Gallons of Fuel Remaining
100 200 300 400
Number of Miles Traveled
*
Which function can be used to find y, the number of gallons of fuel remaining in the tank of
the semitruck after is has traveled x miles?
A y = 240x - 30
y=-x + 240
C y = 240x - 10
+ 240

Ineed with number 6 , explain how to get 1978

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)