Suppose that the weight (in pounds) of an airplane is a linear function of the amount of fuel (in gallons) in its tank. When carrying 18 gallons of fuel, the airplane weighs 2217 pounds. When carrying 44 gallons of fuel, it weighs 2386 pounds. How much does the airplane weigh if it is carrying 60 gallons of fuel?

You have two points relating fuel and weight.

(15,2187) and (35,2303)

slope = (2303-2187)/(35-15) = 5.8

intercept = ?

2187 = 5.8*15 + b

b = 2100

Equation:

f(x) = 5.8x + 2100

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f(50) = 2390 lbs.

Step-by-step explanation:

If each CD at store A costs $.70, then 20 of them will cost 20(.7) = $14.

If each CD at store B costs $.60, then 20 of them will cost 20(.6) = $12.

The correct statement is that The cost at Store A is $2.00 greater than at Store B.