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3 years ago

Match the following items.

Mathematics

1 answer:

rodikova [14]3 years ago

6 0

Look at the 2 out of 5 to the two decimals 5 they are the same

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A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds, by th

iris [78.8K]

Answer:

t = 15.42 s

Step-by-step explanation:

A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds, by the given equation.

$y=-16x^2+242x+73$

We ned to find the time when the rocket will the ground. For this, y = 0

$-16x^2+242x+73=0$

It is a quadratic equation whose solution is given by :

$x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}$

Here, a = -16, b = 242 and c = 73

$x=\dfrac{-b+ \sqrt{b^2-4ac} }{2a}, x=\dfrac{-b-\sqrt{b^2-4ac} }{2a}\\\\x=\dfrac{-242+ \sqrt{(242)^2-4(-16)(73)} }{2(-16)}, x=\dfrac{-242- \sqrt{(242)^2-4(-16)(73)} }{2(-16)}\\\\=-0.295\ s, 15.42\ s$

Neglecting negative value.

So, it will hit the ground in 15.42 s.

5 0

2 years ago

Write an expression that shows how you can multiply 9×475 using expanded form and distributive form

Dima020 [189]

Expanded form:

9(400+70+5)

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3 years ago

I giveeeeee brainlilstttttt

Nataly_w [17]

Answer:

A (8,0)

B (8,8)

C (6,8)

D (6,0)

Step-by-step explanation:

Im pretty sure your can just flip the negative signs for "x" cause your flipping it across the y axis which changes the sign.

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2 years ago

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What is the percent when the balance goes from $300 to $60?

joja [24]

Answer:

80% decrease

Step-by-step explanation:

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Can someone help me with this

11Alexandr11 [23.1K]

-6 + x = -7

+6 +6 add 6 to both sides, 6's cancel out on the left.

________

x = -1, is the answer.

Hope this helps! Let me know if you have any other questions related to this problem. :)

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2 years ago

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