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2 years ago

11

a cable installer charges $42.50 per hour plus a $60.00 service charge your fathers firm hires him to hook up his companys inter

net service find the total charges if it takes the cable installer 3.5 hour to completed the task

1 answer:

denis23 [38]2 years ago

6 0

$208.75 because $42.50 x 3.5= 148.75 but you have to add the 60 so 148.75+60=208.75 I hope this helps, if not, I can explain more.

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3 years ago

A chemist wishes to mix a solution that is 6% acid. She has on hand 14 liters of a 4% acid solution and wishes to add some 10% a

jonny [76]

she should add 7 liters of 10% acid solution

Explanation

Step 1

set the equation:

a) let X represents the amount os solution that is 4% acid

let Y represents the amount os solution that is 10% acid

so

I)

$\begin{gathered} \frac{4}{100}X+\frac{10}{100}Y=\frac{6}{100}(x+y) \\ \end{gathered}$

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$\begin{gathered} \frac{4}{100}X+\frac{10}{100}Y=\frac{6}{100}(X+Y) \\ \frac{4}{100}*14+\frac{10}{100}Y=\frac{6}{100}(X+Y) \\ 0.56+0.1Y=0.06(14+Y) \\ 0.56+0.1Y=0.84+0.06Y \\ \end{gathered}$

Step 2

solve the equation :

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