Question

The graph models the height of a burning candle over a 10-hour period.

What is the rate of change of the candles height?

Answer 1

Answer:

D. -1.5 cm/hour

Step-by-step explanation:

Rate of change = $\frac{y_2 - y_1}{x_2 - x_1}$

Using the coordinates of the two points on the line, (0, 18) and (4, 12),

Let,

$(0, 18) = (x_1, y_1)$

$(4, 12) = (x_2, y_2)$

Plug the values into the formula for rate of change.

Rate of change = $\frac{12 - 18}{4 - 0}$

$= \frac{-6}{4}$

Simplify

$= \frac{-3}{2} = -1.5$

Rate of change = -1.5 cm/hour