Question

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

Answer 1

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

Answer 2

@Mehek14

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

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

Answer 7

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

Answer 8

i got 288?

Answer 9

Ok but those arent on my answer choices

Answer 10

it's actually 1.13

Answer 11

would it be 30.25?

Answer 12

yes

Answer 13

ok thank you

Answer 14

yw

Answer 15

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

Answer 16

yea

Answer 17

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

Answer 18

the last one

Answer 19

Ok that is what i was thinking

Answer 20

Which of the quadratic functions has the narrowest graph?

12.6 in.
6.3 in.
10.8 in.
8.9 in.

Answer 21

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

Answer 22

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

Answer 23

oops sorry

Answer 24

dont i just times?

Answer 25

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

Answer 26

are u sure it isnt 6.3 in?

Answer 27

did u times or how did u figure it out?

Answer 28

6.3*6.3 = 39.69
39.69/2=19.845

Answer 29

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

Answer 30

mehek u got dis?

Answer 31

@Mehek14

Answer 32

so 8.9*8.9=79.21
79.21/2=39.605

Answer 33

So am i right or is it 8.9?

Answer 34

yes 8.9

Answer 35

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

Answer 36

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

Answer 37

C

Answer 38

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

Answer 39

ohh ok

Answer 40

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?

Answer 41

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

Answer 42

-48/2*-16

Answer 43

i get 384

Answer 44

-48/-32=1.5

Answer 45

what is the ft?

Answer 46

42 or 54?

Answer 47

1.5 is the time

Answer 48

Yeah I know, I just dont know the feet

Answer 49

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

Answer 50

plug 1.5 for t in the equation

Answer 51

114 :)

Answer 52

so D

Answer 53

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