B. Slope = 0; horizontal line
C. The line has no slope; it's a horizontal line.
D. Slope = 0; vertical line
I believe the answer is B
0.7x = 45; x = $64.29
7x = 45; x = $6.43
x + 0.07x = 45; x = $42.06
B) 10 3/4 square feet
C) 13 3/4 square feet
D) 15 1/2 square feet