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telo118 [61]
3 years ago
11

A teacher uses a strong slingshot to release an object from the top of a school high in the air. The function a(t)=-16t^2+128t+5

0 gives the approximate altitude, in feet, of the object t seconds after it is released. How long will it be before the object hits the ground? Round to the nearest second.​
Mathematics
1 answer:
inessss [21]3 years ago
8 0

Ground: y = 0

- 16t² + 128t + 50 = 0

Apply quadratic equation.

t = 0, 8 (rounded to the nearest second)

8 seconds

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Can someone help me ?
GenaCL600 [577]

You first need to multiply the whole second equation by to. So, your two equations would then be -8x + 5y = -9 and 8x + 6y = -46. You then add the two equations to get 11y = -55. This would mean you get y = -5. Then you substitute -5 for y in the first equation. This would mean it would be -8x -25 = -9. Then you add 25 to both sides to get -8x = 16. Then you divide both sides by -8 to get x = -2.

4 0
3 years ago
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What is the value for 19 - 6x = y when x = 7 ?<br><br> 6<br> 13<br> -23<br> 32
Nutka1998 [239]

Answer: -23

Step-by-step explanation:

19 - 6(7) = y

19 - 42 = y

y = -23

5 0
2 years ago
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A rental car agency charges $12 per day plus 14 cents per mile to rent a certain car. Another agency charges $15
Sav [38]

Answer:

The cost of renting will be the same for 200 miles.

Step-by-step explanation:

Let n the number of miles and C be the cost. We can represent the cost equations for each companies:

A: C = 12 + 0.09n

B: C = 8 + 0.11n

They want to know when the cost will be the same, so we can set the above 2 equations equal to each other and solve for n:

12 + 0.09n = 8 + 0.11n

0.02n = 4

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3 0
2 years ago
Please help with this and pls explain how to got this in simple words! Thank you! Will give brainliest to the best answer! Pleas
KengaRu [80]

Answer:

$60775000

Step-by-step explanation:

Question ask for how much $ you lose in 52 weeks.

You're given that computer is down 2.75 hours per week. Each of those hours cost you $425000.

In other word, you loose 2.75×425000=$1168750 each week.

If 1 week cost you $1168750,

then 52 weeks, you'll lose 1168750×52=$60775000

8 0
2 years ago
I don’t need to know how to solve it I’m going to ask my teacher how to tomorrow but for now I need help on these
Mars2501 [29]
1) slope=3 and y-int.=-5
2) slope=2 and y-int.=-6
3) slope=-6 and y-int.=1/2
4) slope=-7 and y-int.=5/2
5) slope=1/2 and y-int.=7
6) slope=3/4 and y-int.=8
7) slope=-2/3 and y-int.=-1/3
8) slope=-1/8 and y-int.=-3/8
9) slope=2/3 and y-int.=5
10) slope=-2/7 and y-int.=-1
11) slope=-3 and y-int.=6
12) slope=4 and y-int.=7
Hope this helps!
4 0
3 years ago
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