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Art [367]
3 years ago
11

Please answer me fast plz ​

Mathematics
1 answer:
yulyashka [42]3 years ago
7 0

Answer:

find the classmark of each interval

  • forexample
  • (140+150)/2
  • (150+160)/2

do the same up to (190+200)/2

then

draw a graph by using frequently (number of weeks) on y-axis against classmark on x-axis

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A model rocket is launched with an intitial upupward velocity of 202 ft/s. The rocket’s height h (in feet) after seconds is give
dsp73

Given that the height of a object thrown within a gravitational field is given as a quadratic equation in time, <em>t</em>, the time at which the object is at a specified height can be found by the quadratic formula

The values of, <em>t</em>, for which the height of the rocket is 82 feet are;

t = 12.21 seconds or t = 0.42 seconds

Question: <em>Parts of the question that appear missing but can be found online are (i) To find the values of the time, t, when the rocket's height is 82 feet and round answers to the nearest hundredth</em>

The known parameters of the rocket are;

The initial upward velocity of the rocket, v = 202 ft./s

The given function representing the height, <em>h</em>, (in feet) after <em>t</em> seconds is presented as follows;

H = 202·t - 16·t²

The unknown;

The time for which the height of the rocket is 82 feet

Method;

Substitute H = 82 feet in the height function equation and solve for <em>t</em> as follows;

When H = 82, we get;

82 = 202·t - 16·t²

Therefore;

16·t² - 202·t + 82 = 0

Dividing the above equation by <em>2</em> gives;

(16·t² - 202·t + 82)/2 = 0/2

8·t² - 101·t + 41 = 0

By using the quadratic formula, we get;

\mathbf{t = \dfrac{101 \pm \sqrt{(-101)^2 - 4 \times 8 \times 41} }{2 \times 8}  =  \dfrac{101 \pm \sqrt{8889} }{16}}

Therefore, the values of <em>t</em> given by rounding off to the nearest hundredth are;

t = 12.21 or t = 0.42

The values of the time, <em>t</em>, at which the height of the rocket is 82 feet are t = 12.21 seconds or t = 0.42 seconds

Learn more about equation models of height as a function of time here;

brainly.com/question/84352

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3 years ago
To join a gym, you have to pay an initial fee of $50 and $30 per month. Write an equation representing total cost (t).
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50+30m= t

m: number of months
t: total
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3 years ago
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Y - (-8) &gt; -12 = ?<br><br> im slow
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Answer:

(-8,-2) (-4,6)

Step-by-step explanation:i just got the answer

4 0
2 years ago
2) AT&amp;T charges an initial fee of $5.80 plus $0.30 per text. If Izzy has her cell phone
balu736 [363]

Answer: 50 texts

Step-by-step explanation: 20.8 - 5.80 = 15

15 ÷ .30 = 50

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3 years ago
You invest $5,000 in a savings account that earns 6% interest each year.
weqwewe [10]
A. Multiply $5000 by .06, and add it back to $5000 to get the total after one year. This is $5300.
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A. $5300
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