Question

practice
a scuba diver is ascending to the surface. the equation d = 3t - 90 represents the divers depth in feet, d, after t minutes.
in this equation, what do the numbers 3 and -90 represent?
a. 3 is the initial depth, and -90 is the rate of ascent.
b. 3 is the rate of ascent, and -90 is the initial depth.
c. 3 is the time it takes to ascend, and -90 is the final depth.
3 is the total depth change, and -90 is the target depth.

Explanation:

The equation $d = 3t-90$ is in the form of a linear - equation $y = mx + b$, where $m$ is the slope and $b$ is the y - intercept. In the context of the scuba - diver's depth, the coefficient of $t$ (which is 3) represents the rate of change of depth with respect to time, i.e., the rate of ascent. When $t = 0$, $d=-90$, so - 90 represents the initial depth.

Answer:

B. 3 is the rate of ascent, and -90 is the initial depth.