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mrs_skeptik [129]
3 years ago
8

Choose the expression that would equal the number of hours in the following question.

Mathematics
1 answer:
Minchanka [31]3 years ago
5 0
<span>B. 285/302. This is the correct answer because it is the only choice which is roughly the same ratio as 47.5/50.5 which is the ratio needed to determine how long it would take to go 47 1/2 miles in a car that averages 50 1/2 miles per hour. The mathematical equation which represents the problem is: 50.5/1 = 47.5/A (A = hours) which is the same as 50.5 A = 47.5 which means A = 47.5/50.5 which means A = .94 hours. 285/302 also equals .94.</span>
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How can I write 1/27 as an expression without using a fraction bar?​
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Answer:

1÷27

Step-by-step explanation:

the fraction bar just means to divide so 3/4 is 3÷4

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3 years ago
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What is the relationship between the volume of a cone<br> and the volume of a cylinder? Explain.
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How to solve the inequality by graphing
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4 years ago
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Reptile [31]

Answer:

The time it takes for the cannonball to hit the ground is 6.49 seconds.

Step-by-step explanation:

You know that the height of the cannonball above the ground, h, in meters, in time, t, in seconds, is found by the function h(t) = -4.9t² + 30.5t + 8.4. You want to calculate the time it takes for the cannonball to hit the ground, that is, the time it takes for the bullet to reach zero height. So, being h(t) = 0 you have:

0 = -4.9t² + 30.5t + 8.4

To solve a quadratic function 0=a*x² + b*x +c, the expression is applied:

\frac{-b+-\sqrt{b^{2} -4*a*c} }{2*a}

In this case, being a = -4.9, b =30.5 and c =8.4  you have:

\frac{-30.5+-\sqrt{30.5^{2} -4*(-4.9)*8.4} }{2*(-4.9)}

Solving you get:

t1= -0.26 seconds and t2=6.49 seconds

Since time does not have a negative value, then <u><em>the time it takes for the cannonball to hit the ground is 6.49 seconds.</em></u>

3 0
3 years ago
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