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3 years ago

What percent of 60 is 15

Mathematics

2 answers:

Paladinen [302]3 years ago

4 0

1) Mental math approach:
<span>15 is 1/4 of 60, and 1/4 is </span><span>25%</span>

ozzi3 years ago

3 0

Well we know that
15/60 can be reduced to 1/4
And 1/4 can be turned into a percent as 25%

So your answer is 25%

Good Luck! :)

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4.Is it sometimes, always, or never true that, if A and B both have dimensions n x n , AB=BA ? Explain.

REY [17]

Answer: Is true sometimes.

Step-by-step explanation:

I guess that here we have two matrices, A and B, that are nxn.

We can see that if those matrices can conmutate, then we can try it with some simple matrices.

$A = \left[\begin{array}{ccc}1&0\\0&-1\end{array}\right] . B = \left[\begin{array}{ccc}2&0\\1&1\end{array}\right]$

Here, we would have that:

$AB = \left[\begin{array}{ccc}2&0\\-1&-1\end{array}\right]$

$BA = \left[\begin{array}{ccc}2&0\\1&-1\end{array}\right]$

You can see that AB and BA are different, then the statement is not always true.

But it is true sometimes, if A or B are the identiti, then I*A = A*I, in this case would be true.

It is also true if A and B are diagonal matrices, let's prove it:

$A = \left[\begin{array}{ccc}a&0\\0&b\end{array}\right] , B = \left[\begin{array}{ccc}c&0\\0&d\end{array}\right]$

$AB = \left[\begin{array}{ccc}ac&0\\0&bd\end{array}\right] = BA$

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4 years ago

Which of the following expressions is a factor of the polynomial x2+3/2x-1?

mafiozo [28]

Answer:

the answer is x-1/2

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3 years ago

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castortr0y [4]

The answer is 2.5 g/cm 3 :)

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OlgaM077 [116]

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Joy has already written 10 pages of a novel she plans to write 15 additional pages per week until she is finished write and solv

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Answer:

y=100 pages

Step-by-step explanation:

y=15x+10

y=15(6)+10

y= 90+10

y=100

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3 years ago