mckenzieandjesus
  • mckenzieandjesus
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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mckenzieandjesus
  • mckenzieandjesus
the function is h=-16t^2+36t+10
mckenzieandjesus
  • mckenzieandjesus
@Mehek14
Mehek14
  • Mehek14
use the formula \(\sf{\dfrac{-b}{2a}}\)

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mckenzieandjesus
  • mckenzieandjesus
how do i know which numbers to put into the formula?
Mehek14
  • Mehek14
\(\sf{ax^2+bx+c}\)
Mehek14
  • Mehek14
so for a, you have -16 for b, you have 36
Mehek14
  • Mehek14
\(\dfrac{-36}{2*-16}\)
mckenzieandjesus
  • mckenzieandjesus
i got 288?
mckenzieandjesus
  • mckenzieandjesus
Ok but those arent on my answer choices
Mehek14
  • Mehek14
it's actually 1.13
mckenzieandjesus
  • mckenzieandjesus
would it be 30.25?
Mehek14
  • Mehek14
yes
mckenzieandjesus
  • mckenzieandjesus
ok thank you
Mehek14
  • Mehek14
yw
mckenzieandjesus
  • mckenzieandjesus
i can't figure out a few other questions.. can u help me?
Mehek14
  • Mehek14
yea
mckenzieandjesus
  • 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
  • Mehek14
the last one
mckenzieandjesus
  • mckenzieandjesus
Ok that is what i was thinking
mckenzieandjesus
  • mckenzieandjesus
Which of the quadratic functions has the narrowest graph? 12.6 in. 6.3 in. 10.8 in. 8.9 in.
1 Attachment
Mehek14
  • Mehek14
Which of the quadratic functions has the narrowest graph?? I think that's for the other question
mckenzieandjesus
  • mckenzieandjesus
Find the value of x. If necessary, round to the nearest tenth.
mckenzieandjesus
  • mckenzieandjesus
oops sorry
mckenzieandjesus
  • mckenzieandjesus
dont i just times?
Mehek14
  • Mehek14
8.9 is the closest it would be 39.6 which is the closest to 40
mckenzieandjesus
  • mckenzieandjesus
are u sure it isnt 6.3 in?
mckenzieandjesus
  • mckenzieandjesus
did u times or how did u figure it out?
Mehek14
  • Mehek14
6.3*6.3 = 39.69 39.69/2=19.845
Mehek14
  • Mehek14
formula\(\dfrac{base*height}{2}\)
anonymous
  • anonymous
mehek u got dis?
anonymous
  • anonymous
@Mehek14
1 Attachment
mckenzieandjesus
  • mckenzieandjesus
so 8.9*8.9=79.21 79.21/2=39.605
mckenzieandjesus
  • mckenzieandjesus
So am i right or is it 8.9?
Mehek14
  • Mehek14
yes 8.9
mckenzieandjesus
  • 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
  • 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
  • Mehek14
C
Mehek14
  • Mehek14
because the solutions are x = -4 x = 7/2 = 3.500
mckenzieandjesus
  • mckenzieandjesus
ohh ok
mckenzieandjesus
  • 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
  • mckenzieandjesus
would i do \[48/2*-16?\]
Mehek14
  • Mehek14
-48/2*-16
mckenzieandjesus
  • mckenzieandjesus
i get 384
Mehek14
  • Mehek14
-48/-32=1.5
mckenzieandjesus
  • mckenzieandjesus
what is the ft?
mckenzieandjesus
  • mckenzieandjesus
42 or 54?
Mehek14
  • Mehek14
1.5 is the time
mckenzieandjesus
  • mckenzieandjesus
Yeah I know, I just dont know the feet
mckenzieandjesus
  • 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
  • Mehek14
plug 1.5 for t in the equation
mckenzieandjesus
  • mckenzieandjesus
114 :)
Mehek14
  • Mehek14
so D
mckenzieandjesus
  • 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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