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Savatey [412]
3 years ago
11

An election charges $30 for a service call plus $75 per hour of service.if he changed $210 how many hours did he work?

Mathematics
2 answers:
andreev551 [17]3 years ago
5 0
2 hours because u add the 30
Goshia [24]3 years ago
4 0
Your answer would be 2 because 75*2 is 150 and 30*2 is 60. Add those together and you get $210
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Answer:

Option A is correct.

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Step-by-step explanation:

Given the expression

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Solving the rational function

\frac{5}{x}=\frac{4x+1}{x^2}

Apply fraction across multiply: if \frac{a}{b}=\frac{c}{d}\mathrm{\:then\:}a\cdot \:d=b\cdot \:c

5x^2=x\left(4x+1\right)

Subtract x(4x+1) from both sides

5x^2-x\left(4x+1\right)=x\left(4x+1\right)-x\left(4x+1\right)

Simplify

5x^2-x\left(4x+1\right)=0

5x² - 4x² - x = 0

x² - x = 0

Factor x² - x = x(x-1)

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Using the zero factor principle

if ab=0, then a=0 or b=0 (or both a=0 and b=0)

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But, it is clear that if we substitute x = 0, the equation becomes undefined because we can not have the denominator to be 0.

In other words, the equation is undefined for x = 0

Thus, x = 0 is an extraneous solutions.

Therefore, option A is correct.

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