Equations:
y = 20x
y = 20x + 10
y = 20x - 15
The second and third graphs are related to the first graph by having parallel slope, due to the increase in cost total is $20/month.
His average is 80%. You take the two scores add them up and divide by the number of scores.
For this problem, you are to multiply the numbers and add the exponents for the variables
10*3= 30
x*x^4= x^5
y^5*y^6= y^11
z^3*z^3= z^6
the answer to the question is 30x^5y^11z^6