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kramer
3 years ago
7

A ball is kicked upward with an initial velocity of 56 feet per second. The ball's height h (in feet) can be expressed as a func

tion of time t (in seconds) by the equation h = -16t2 + 56t. How much time does the ball take to return to the ground?
A) 1.75 seconds
B) 2.50 seconds
C) 2.75 seconds
D) 3.50 seconds
Mathematics
1 answer:
andrew11 [14]3 years ago
5 0

Answer:

  D)  3.50 seconds

Step-by-step explanation:

You are interested in the positive value of t such that h=0. Substituting 0 for h, we get ...

  0 = -16t^2 +56t

  0 = -16t(t -3.5) . . . . . factored form

The product is zero when the factors are zero. Here, the factor of interest is ...

  0 = t-3.5

  3.5 = t . . . . . add 3.5 to both sides

The ball takes 3.5 seconds to return to the ground.

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3 years ago
Marian borrowed money to buy a sound system that costs $450. She is charged 5% simple interest for one year what is the total am
yarga [219]

Marian will pay $472.50 for the sound system if she pays the full amount in one year.

Step-by-step explanation:

Given,

Money borrowed for sound system = $450

Interest rate = 5%

Amount of interest = 5% of money borrowed

Amount of interest = \frac{5}{100}*450

Amount\ of\ interest=\frac{2250}{100}\\\\Amount\ of\ interest=\$22.50

If she pays the amount in one year;

Total amount to be paid = Money borrowed + Amount of interest

Total amount to be paid = $450 + $22.50 = $472.50

Marian will pay $472.50 for the sound system if she pays the full amount in one year.

Keywords: interest, addition

Learn more about addition at:

  • brainly.com/question/10708697
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#LearnwithBrainly

5 0
3 years ago
Read 2 more answers
[IMAGE ATTACHED]<br> PLEASE HELP!!
Kay [80]
Answer: y=24

Explanation:
start by adding the two expressions
7y+12=180
7y=168
168/7
y=24

Plug it in/Check your work:
3(24)+5=77
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3 years ago
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