13. A diving board is 5 feet above the water level of the pool. A swimmer steps off the board into the water. The function d
-16x² + 5 gives
the distance d of the swimmer's feet above the water level after x seconds.
a. When do the swimmer's feet hit the water?
b. When will the swimmer's feet be 4 feet below the water level?
c. The high diving board is 15 feet above the water level of the pool. How
could you translate the function d = –16x2 + 5 to adjust for the height
of the high diving board?

congruent segments

step-by-step explanation:

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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step-by-step explanation: