If y = 2x + 1, what is the arithmetic mean of 2x, 2x, y, and 3y, in terms of x?
A)2x
B)2x + 1
C)3 x + 1
D)None of the above

Question

Quizplus · Accepted Answer

the arithmetic mean of 2x, 2x, y, and 3y, where y = 2x +1 is 3x + 1.
Solution
The arithmetic mean (average) is equal to the sum of the items divided by the number of items.
Average = (2x + 2x + y + 3y)/4 = (4x + 4y)/4 = x + y
Substituting 2x +1 for y: x + (2x + 1) = 3x + 1
Check (assume x = 3): (6 + 6 + 7 + 3(7))/4= 10 = 3(3)+1

If Y = 2x + 1, What Is the Arithmetic