Let f(x, y, z) be the amount of heat lost each day by a rectangular building x feet wide, y feet long, and z feet high. Suppose that (50, 80, 15) = 45. Which one of the following conclusions can be drawn?

Question

A. A building with dimensions 50 × 80 × 15 loses about 45 units of heat each day.
B. A building with dimensions 51 × 81 × 16 will lose about 45 more units of heat each day than a building with dimensions 50 × 80 × 15 .
C. A building with dimensions 50 × 80 × 15 loses about 45 units of heat from the top of the building each day
D. A building with dimensions 50 × 80 × 16 will lose about 45 more units of heat each day than a building with dimensions 50 × 80 × 15 .
E. The marginal heat loss per day is 45 units of heat per square foot of surface area of the roof.

Answer 1

Answer: D