Answer:

Step-by-step explanation:
<u>Given:</u>

<u>Substitute:</u>
into 

<u>Swap the sides:</u>
<u />
<u>Divide both sides of the equation by the coefficient of variable:</u>
<u />
<u>Cross out the common factor:</u>
<u />
<u>Find the equation of the function:</u>
<u />
<u>Substitute:</u>
<u />
<u>Calculate the product or quotient:</u>
<u />
Answer:
im not sure, i will try to figure it out for you
Step-by-step explanation:
Answer:
289.92
Step-by-step explanation:
Multiply the numbers together
2.50 x 4 = 10
20 - 10 = 10
so his change would be $10