Your new smart car runs on a mixture of ethanol and gas. It has a 15 gallon tank to fill. You can buy two types of fuels, one that is 30 percent ethanol and another that is 80 percent ethanol. How much of each type of fuel should you use so that the mixture is 40 percent ethanol?

step-by-step explanation:

a) 32pie square meters

step-by-step explanation:

answer are

step-by-step explanation:

55.44 inches

step-by-step explanation:

part a. assuming a perfectly linear relationship, we can find the slope from the first two data points.

slope = m = (change in rainfall)/(change in years)

= (61.80 -62.33)/(2005 -2004) = -0.53/1 = -0.53

then the point-slope form of the equation of the line can be written as

y = m(x -h) +k . . . . . m = -0.53, (h, k) = (0, 62.33)

y = -0.53x +62.33 . . . x = years after 2004

part b. in 2017, x = 2017 -2004 = 13. then the predicted rainfall is

y = -0.53·13 +62.33 = 55.44 . . inches

the predicted rainfall in 2017 is 55.44 in.