Question

What of the rate at which the water was drained from the tank?6 gallons of water per minute11 gallons of water per minute45 gallons of water per minute120 gallons of water per minute

Answer 1

To find the rate, we use the following formula

$r=\frac{y_2-y_1}{x_2-x_1_{}}$

Let's replace the points (10,450) and (30, 330).

$r=\frac{330-450}{30-10}=\frac{-120}{20}=-6$

Hence, the rate is 6 gallons of water per minute drained.

The right answer is A.