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3 years ago

In a class of 300 students ,20% are girls how many boys are there?

Mathematics

2 answers:

Bingel [31]3 years ago

4 0

Answer:

240 boys

Step-by-step explanation:

300×0.20=60 are girls

300-60=240 total of boys

emmainna [20.7K]3 years ago

3 0

Answer:

240 students are boys

Step-by-step explanation:

20% of 300 = 60

300 - 60 = 240

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After Megan walked 5 miles her activity tracker had counted 9780 steps David activity calendar had counted 11,928 steps after he

Alex

Answer:

David 1,988-1,956+32

It is David because when you find the unite ratio you get 1,988 for David and 1,956 for Megan.

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3 years ago

John runs 15 miles in 3hours. how many miles can john run per hour

nata0808 [166]

Answer:

5 miles an hour

Step-by-step explanation:

15 divided by 3

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3 years ago

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FinnZ [79.3K]

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3 years ago

Using all of the following numbers once, 8,8,3,5 how do u get 10

Sveta_85 [38]

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3 years ago

What are the real zeros of x^3+4x^2-9x-36

Katyanochek1 [597]

Answer:

$x = -4\\x = -3\\x = 3$

Step-by-step explanation:

To find the real zeros you must match the function to zero and factor the expression.

We have a polynomial of degree 3.

We try to group the terms to perform the factorization

$x ^ 3 + 4x ^ 2-9x-36 = 0\\\\x ^ 2(x + 4) - 9(x + 4) = 0$

Now we take (x + 4) as a common factor

$(x + 4)(x ^ 2 -9) = 0$

If we have an expression of the form $(a ^ 2-b ^ 2)$ we know that this expression is equivalent to:

$(a ^ 2-b ^ 2) = (a + b)(a-b)$

In this case

$a = x\\b = 3$

So:

$(x ^ 2 -9) = (x + 3)(x-3)$

Finally:

$x ^ 3 + 4x ^ 2-9x-36 = (x + 4)(x + 3)(x-3) = 0$

The solutions are:

$x = -4\\x = -3\\x = 3$

6 0

3 years ago