Student grades on a recent science test follow; 78, 81, 89, 75, 76, 91, 10963, 80, 87, 91, 95. Find the MEAN (average) to the nearest tenth.

• 76.9
• 83.0
• 83.8
• 83.3

Explained below

Step-by-step explanation:

I shall explain this

Add all the numbers together and divide by the number of numbers

x + 107

step-by-step explanation:

let's say that the number he had before the mistake was x. then, he will have 107 dollars more than this, so the answer is x + 107.

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