Question

someone please help i need to learn for this for quiz!!!!


The function d(s) = –5s – 15 models the depth, in feet, of a rock that Dante dropped into a lake s seconds after he lost sight of the rock.

What is the meaning of the x-intercept?

Dante saw the rock for 15 s before losing sight of it.

Dante saw the rock for 3 s before losing sight of it.

Dante lost sight of the rock when it was 15 ft below the lake’s surface.

Dante lost sight of the rock when it was 3 ft below the lake’s surface.

Answer 1

can someone please help

Answer 2

d(s) = -5s + 15
same thing as y = -5s + 15
and to find the x intercept (which is gonna be s), we would sub in 0 for y
0 = -5s + 15
5s = 15
s = 3....so Danta saw the rock for 3 seconds before losing sight of it.
questions ?

Answer 3

Makes perfect sense thanks