Sam's test scores for the term were 60, 89, 83, 99, 95, and 60.

1. suppose that sam's teacher decided to base the term grade on the mean.

a. what grade would sam receive?

b. do you think this is a fair grade? explain your reasoning.

(a) 81

              (b)  it is a fair grade

Step-by-step explanation: Mean is the same as average :

Finding the average ⇒ 60 + 89+83+ 99 + 60 / 6

                                   = 486/6

                                    = 81

It is actually a fair grade on the average because it will cover up for the 60's in his result

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or