Question

The following table shows the amount of water in a tank after a plug is pulled.How much water is leaking out the tank each second?-7 gallons per second-4 gallons per second-5 gallons per second-9 gallons per second

Answer 1

This problem is asking for the ratio of change.

To find the ratio, we have to use two pairs: (3, 223) and (9, 193).

Then, we use the following formula.

$r=\frac{y_2-y_1}{x_2-x_1}$

Where,

$\begin{gathered} x_1=3 \\ x_2=9 \\ y_1=223 \\ y_2=193 \end{gathered}$

We replace these coordinates.

$r=\frac{193-223}{9-3}=\frac{-30}{6}=-5$

Therefore, the water is leaking out 5 gallons per second.

The right answer is C.