14. a rock thrown in a lake sinks at a rate of 4 inches per second. what is the depth of the
rock after 10 seconds?

40 inches

Explanation-

Step 1: Turn this into an equation

We know that the equation will be in y=mx+b We also know that the rate/slope (m) is 4. We now know that the equation is y=4x. Since there is no mention of an intercept (b), we can assume that it is 0. So our equation will end at y=4x

Step 2: Substituting the “x” value

Since “x” represents the seconds, we can substitute that for 10. The equation now turns into y=4(10)

Step 3: Solving

By multiplying the numbers in the equation, we can now get the final result. y= 4(10) y=40

Step 4: Final answer

Since y=40, the depth is 40 inches

Hope this helps :)