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3 years ago

Which expressions are equivalent to 10a - 25 + 5b

Mathematics

1 answer:

sergey [27]3 years ago

5 0

Answer:

Step-by-step explanation:

$10a-25+5b\\\\-2(-5a-25+5b)=(-2)(-5a)+(-2)(-25)+(-2)(5b)\\=10a+50-10b\qquad NOT\\\\(2a-5+b)(5)=(2a)(5)+(-5)(5)+(b)(5)=10a-25+5b\qquad YES\\\\10(a-2.5+0.5b)=(10)(a)+(10)(-2.5)+(10)(0.5b)\\=10a-25+5b\qquad YES\\\\(-2a+5-b)(-5)=(-2a)(-5)+(5)(-5)+(-b)(-5)\\=10a-25+5b\qquad YES\\\\-10(-a-2.5-0.5b)=(-10)(-a)+(-10)(-2.5)+(-10)(-0.5b)\\=10a+25+5b\qquad NOT$

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3 years ago

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aev [14]

Using the percentage concept, it is found that 75% of the population of Gorgeous Sunset is on Beautiful Sunrise now.

<h3>What is a percentage?</h3>

The percentage of an amount a over a total amount b is given by a multiplied by 100% and divided by b, that is:

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In this problem, we have that:

We consider that the population of both Beautiful Sunrise and Gorgeous Sunset islands is of x.

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The percentage of people from Gorgeous Sunset is on Beautiful Sunrise now is:

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Now the number of people on Beautiful Sunrise is seven times the number of people on Gorgeous Sunset, hence:

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We can find a <u>as a function of x</u> to find the percentage:

$\frac{x + a}{x - a} = 7$

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You can learn more about the percentage concept at brainly.com/question/10491646

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Answer:

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3 years ago

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Answer:

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