1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
IRINA_888 [86]
2 years ago
9

A ball is dropped from a height of 64 feet. Its height, in feet, can be modeled by the function h(t) = -167 + 64, where t is the

time in seconds since it is dropped.
(a) Find how long it takes the ball to reach the ground.
(b) Find how long it takes the ball to fall 36 feet. (Hint: first find its
height.)
Mathematics
1 answer:
Oliga [24]2 years ago
3 0

Answer:

Step-by-step explanation:

Known facts:

  • the ball dropped from a height of 64 feet
  • function h(t) = -16t^{2}  + 64

First question:

  • the ball hits the ground when h(t) = 0, thus we get the equation

                      -16t^{2} +64 = 0\\16t^{2} = 64\\t^{2} =4\\t = 2

     So the ball hits the ground in 2s

Second question

  • to find how long it takes the ball to fall 36 feet, we must set h(t) = 64 - 36 = 28

                      -16t^{2} +64 = 28\\16t^{2} = 36\\t = \frac{6}{4} =1.5s

      So the ball hits the ground in 1.5s

Hope that helps!

You might be interested in
The average mass of a giraffe is approximately 1x 10^8 kilograms. The average mass of a blue whale is approximately 2x 10^6 kilo
Basile [38]

Answer:

Giraffe = 1,000 kg

Whale = 2,000,000 kg

Step-by-step explanation:

Whale has 2,000 times the mass.

Can I please get Branliest and rate, like Thank you!

6 0
2 years ago
9. Jack is learning to save, spend, and give his money away to charities. He has determined to give 10% of his summer job earnin
Kamila [148]

Answer:

$2560

Step-by-step explanation:

if 10%=256

then 10 times the amount 100% is 2560

4 0
3 years ago
Paisley is going to invest $28,000 and leave it in an account for 14 years. Assuming the interest is compounded monthly, what in
abruzzese [7]

Answer:

r=7

Step-by-step explanation:

74000=28000(1+r/12)^12(14)

divide 74000 by 28000, and cancel out 28000.

1.00580=1+r/12

(100) .06962=r

r = 6.96198

the 6 after the 9 rounds 9 to 0, which rounds the 6 to 7

r=7

5 0
3 years ago
Given I=prt,where I=4.5,p =500,and t=2.5,what is r as a percent?
KIM [24]
PLUG in the numbers 
4.5=500 x R x 2.5
divide both sides by 500
0.009=R x 2.5
divide 2.2 to both sides 
R=.0036
In percent you have to multiply by 100 which is 0.36%
8 0
3 years ago
3. Leanne has a container divided into
Maurinko [17]

Answer:

22 containers but I didn't use a calculator!

3 0
3 years ago
Other questions:
  • D.only 1 <br> Geometry math question no Guessing
    15·1 answer
  • The given data set shows the number of books read by eight children in a reading contest. {40, 15, 14, 15, 10, 11, 18, 20} Which
    9·2 answers
  • Which expression is equivalent to 4.8+2.2w−1.4w+2.4 ?
    9·1 answer
  • The Huey family is purchasing a winter cover for their above ground pool, which is rectangular and has dimensions of 18 feet by
    9·1 answer
  • Can someone help me with this asap.
    10·1 answer
  • What decimal is equivalent to 63/75?
    15·2 answers
  • 8 - 3(x + 2) help please!
    11·1 answer
  • What is a correct name for ange 5?
    15·1 answer
  • Pls helppppppppppppppp
    11·2 answers
  • Helppp this is due in an hour!!​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!