Set 7: Linear Equations (Intermediate)

Explanation

Answer: D

A tank drains according to $V = -5t + 100$ . What does -5 represent?

The time to empty

The tank capacity

The initial volume

The rate of draining in units/time

✓ Correct

Detailed Explanation

Choice D is correct. Choice C is the correct answer. 1. Slope (-5): Rate of change. Volume decreases by 5 per unit time. Choice D is incorrect because 100 is the initial volume. Choice D is incorrect because time to empty is $100 /5 = 20$ . Choice C is incorrect because 100 is the capacity.

Key Steps:

•

The correct answer is The rate of draining in units/time

Why others are wrong:

A: Choice A is incorrect and may result from a calculation error.

B: Choice B is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

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