Serena parachuted from a plane and dropped 15,000 ft, putting her 5000 ft above sea level. how high above sea level was serena when she jumped from the plane? 10,000 ft 5000 ft 15,000 ft 20,000 ft

She was 20,000 ft high when she jumped from the plane.

Step-by-step explanation:

We can solve this problem with addition. Just add the 5,000 ft she was from sea level and the 15,000 feet she had already dropped, and you have how far she dropped, which is 20,00 ft.

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

126 maybe. sorry