A ball is thrown into the air with an upward velocity of 36 ft/s. Its height h in feet after t seconds is given by the function mc016-1.jpg. In how many seconds does the ball reach its maximum height? Round to the nearest hundredth if necessary. What is the ball’s maximum height?
2.25 s; 10 ft
1.13 s; 32.5 ft
1.13 s; 30.25 ft
1.13 s; 70.75 ft

- mckenzieandjesus

- jamiebookeater

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- mckenzieandjesus

the function is h=-16t^2+36t+10

- mckenzieandjesus

- Mehek14

use the formula
\(\sf{\dfrac{-b}{2a}}\)

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## More answers

- mckenzieandjesus

how do i know which numbers to put into the formula?

- Mehek14

\(\sf{ax^2+bx+c}\)

- Mehek14

so for a, you have -16
for b, you have 36

- Mehek14

\(\dfrac{-36}{2*-16}\)

- mckenzieandjesus

i got 288?

- mckenzieandjesus

Ok but those arent on my answer choices

- Mehek14

it's actually 1.13

- mckenzieandjesus

would it be 30.25?

- Mehek14

yes

- mckenzieandjesus

ok thank you

- Mehek14

yw

- mckenzieandjesus

i can't figure out a few other questions.. can u help me?

- Mehek14

yea

- mckenzieandjesus

Which of the quadratic functions has the narrowest graph?
y=1/3 x^2
y=1/8 x^2
y=-2x^2
y=-3x^2

- Mehek14

the last one

- mckenzieandjesus

Ok that is what i was thinking

- mckenzieandjesus

Which of the quadratic functions has the narrowest graph?
12.6 in.
6.3 in.
10.8 in.
8.9 in.

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- Mehek14

Which of the quadratic functions has the narrowest graph??
I think that's for the other question

- mckenzieandjesus

Find the value of x. If necessary, round to the nearest tenth.

- mckenzieandjesus

oops sorry

- mckenzieandjesus

dont i just times?

- Mehek14

8.9 is the closest
it would be 39.6 which is the closest to 40

- mckenzieandjesus

are u sure it isnt 6.3 in?

- mckenzieandjesus

did u times or how did u figure it out?

- Mehek14

6.3*6.3 = 39.69
39.69/2=19.845

- Mehek14

formula\(\dfrac{base*height}{2}\)

- anonymous

mehek u got dis?

- mckenzieandjesus

so 8.9*8.9=79.21
79.21/2=39.605

- mckenzieandjesus

So am i right or is it 8.9?

- Mehek14

yes 8.9

- mckenzieandjesus

OKay thank you!!
I dont understand how to do this
Write the equation in standard form. Then factor the left side of the equation.
2x2 = 28 – x

- mckenzieandjesus

wouldn't it be A?
(2x + 7)(x – 4) = 0
(2x + 4)(x + 7) = 0
(2x – 7)(x + 4) = 0
(2x – 4)(x + 7) = 0

- Mehek14

C

- Mehek14

because the solutions are
x = -4
x = 7/2 = 3.500

- mckenzieandjesus

ohh ok

- mckenzieandjesus

I have one similar to my very fist question..
A ball is thrown into the air with an upward velocity of 48 ft/s. Its height h in feet after t seconds is given by the function h=-16t^2+48t+6 In how many seconds does the ball reach its maximum height? Round to the nearest hundredth if necessary. What is the ball’s maximum height?

- mckenzieandjesus

would i do \[48/2*-16?\]

- Mehek14

-48/2*-16

- mckenzieandjesus

i get 384

- Mehek14

-48/-32=1.5

- mckenzieandjesus

what is the ft?

- mckenzieandjesus

42 or 54?

- Mehek14

1.5 is the time

- mckenzieandjesus

Yeah I know, I just dont know the feet

- mckenzieandjesus

actually it could be 114 too.
1.5 s; 42 ft
3 s; 6 ft
1.5 s; 54 ft
1.5 s; 114 ft

- Mehek14

plug 1.5 for t in the equation

- mckenzieandjesus

114 :)

- Mehek14

so D

- mckenzieandjesus

i did 4*pi*24^2 and got 7238.229474 is that right?
A sports recreation company plans to manufacture a beach ball with a surface area of 7238 in.2 Find the radius of the beach ball. Use the formula A=4 pi r^2 where A is the surface area and r is the radius of the sphere.
576 in.
75 in.
24 in.
48 in

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