According to the 1993 World Almanac, the number of calories a person walking at 3 mph burns per minute depends on the person's weight as in the following table.

(a) On a sheet of paper, graph the linear function for the calories used per minute while walking, $C$, as a function of weight, $w$. Find an approximate formula for this equation.
$C =$ help (formulas)

(b) What is a meaningful domain for your function?
A. $-\infty < w < \infty$
B. $0 \leq w \leq 1000$
C. $0 \leq w$
D. $100 \leq w \leq 220$

(c) What is a meaningful range for your function?
A. $0 \leq C \leq 6$
B. $0 \leq C \leq 100$
C. $0 \leq C$
D. $-\infty < C < \infty$

(d) Use your function from part (a) to determine how many calories per minute a person who weighs 115 pounds uses per minute of walking.
help (numbers)