Y
Finish the steps below to write a quadratic function for
the parabola shown.
8
6
1. Use the vertex form, f(x) = a(x - 1)2 + k, and
substitute in the values for h and k.
f(x) = a(x - 5)2 +3
2. Use another point and substitute in values
for x and f(x). Solve for a.
5 = a(6-5)2 + 3
(6 5
4
2
Vertex:
(5, 3)
3. Write the function, using the values for h, k, and a.
х
The function is f(x)
(x
32+
2
4
6
8

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

answer

you start with $5 and save $10 a week until you have at least $45wer

step-by-step explanation:

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x