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3 years ago

Cheryl has twice as many nickels as quarters and five more dimes than nickels.

Mathematics

1 answer:

maw [93]3 years ago

3 0

Answer:

2 quarters

4 nickels

9 dimes

Step-by-step explanation:

quarters = x

nickels = 2x

dimes = 2x+5

25x+5(2x)+10(2x+5)=160

25x+10x+20x+50=160

55x=160-50

55x=110

x=2

SO:

(x) = 2 quarters

(2x) = 4 nickels

(2x+5) = 9 dimes

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Simplify the expression, only odds 9-17

Elodia [21]

All exercises involve the same concept, so I'll show you how to do the first, then you can apply the exact same logic to all the others.

The first thing you need to know is that, when a certain quantity multiplies a parenthesis, you can distribute that number to every element in the parenthesis. This means that

$a(b+c) = ab+ac$

So, $a$ is multiplying the parenthesis involving $b$ and $c$ , and we distributed it: $a$ multiplies both $b$ and $c$ in the final result.

Secondly, you have to know how to recognize like terms, because they are the only terms you can sum. Two terms can be summed if they have the same literal expression. So, for example, you cannot sum $3x+2y$ , and neither $5x^2-4x$ exponents count.

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So, take for example exercise 9:

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We distribute the 1.2 through the first parenthesis:

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And you can distribute the negative sign through the second parenthesis (it counts as a -1 to distribute):

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7 0

3 years ago

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Naddik [55]

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3 0

3 years ago

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lara [203]

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3 0

3 years ago

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defon

Answer:

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MrRa [10]

Answer:

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Step-by-step explanation:

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