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Please Help. Functions and Relations. A power company calculates a persons monthly bill from the number of kilowatt- hours (kWh), x, used. how much is the bill for a person who used 600 kWh in a month?

Please Help Functions and Relations A power company calculates a persons monthly bill from the number of kilowatt hours kWh x used how much is the bill for a pe class=

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ANSWER:

B. $80

EXPLANATION:

[tex]b(x)=\begin{cases}0.15x,{x\leq400} \\ 0.10(x-400)+60,x>400{}\end{cases}[/tex]

We'll use the below function to determine how much is the bill for a person who uses 600 kWh in a month;

[tex]\begin{gathered} b(x)=0.10(x-400)+60 \\ b(600)=0.10(600-400)+60 \\ =0.10(200)+60 \\ =20+60 \\ =\text{\$}80 \end{gathered}[/tex]

So the bill is $80

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