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2 years ago

13

There are 99 males and 121 females participating in a marathon. What percent of the participants are female? Enter your answer i

n the box

1 answer:

Hoochie [10]2 years ago

6 0

Answer:

55.

Step-by-step explanation:

121 is what percent of 220? = 55.

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Is 2.64 greater or less than 1.9?

Schach [20]

2.64 is greater than 1.9

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3 years ago

On a graph, which characteristic shape is shown by exponential growth?

gulaghasi [49]

It will be a J-shaped graph. As X increases, Y will increase at a sharper rate, so it will look exactly like a J when graphed

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3 years ago

Read 2 more answers

Sean tossed a coin off a bridge into the stream below. The path of the coin can be represented by the equation 2 h tt = − 16t^2+

tekilochka [14]

Answer:

It will take 5.61 seconds for the coin to reach the stream.

Step-by-step explanation:

The height of the coin, after t seconds, is given by the following equation:

$h(t) = -16t^{2} + 72t + 100$

How long will it take the coin to reach the stream?

The stream is the ground level.

So the coin reaches the stream when h(t) = 0.

$h(t) = -16t^{2} + 72t + 100$

$-16t^{2} + 72t + 100 = 0$

Multiplying by (-1)

$16t^{2} - 72t - 100 = 0$

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

$\bigtriangleup = b^{2} - 4ac$

In this question:

$16t^{2} - 72t - 100 = 0$

So

$a = 16, b = -72, c = -100$

$\bigtriangleup = (-72)^{2} - 4*16*(-100) = 11584$

$t_{1} = \frac{-(-72) + \sqrt{11584}}{2*16} = 5.61$

$t_{2} = \frac{-(-72) - \sqrt{11584}}{2*16} = -1.11$

Time is a positive measure, so we take the positive value.

It will take 5.61 seconds for the coin to reach the stream.

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3 years ago

What is the radius of the circle x2+y2=12

valkas [14]

Answer:

Step-by-step explanation:

x²+y²=r²

r²=12

r=√12=2√3

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3 years ago

Which number is a rational number<br> A. 7<br> B. 7.07....<br> C. 8.12....<br> D. 9.94...

Lady bird [3.3K]

Answer:

A

Explanation:

All of the other choices are ongoing decimals which make the irrational numbers

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3 years ago