Find the arithmetic mean between,$1-x+x^2$ and $1+x+x^2$.

Find the arithmetic mean of the data set, 4, 5, 6, 7, and 8.

What is the arithmetic mean of the numbers 6, 8, 10 ?

Find the mean of the first 5 even numbers.

Find the arithmetic mean between, $x-3$ and $x+5$ .

Find the arithmetic mean of the data set, 8, 10, 12, 14, and 16.

Find the arithmetic mean between,6 and 8.

Find the arithmetic mean between,$3\sqrt{5}$ and $5\sqrt{5}$ .

Identify the common difference of an arithmetic sequence given that a₁=12 and a₆=2.

Identify the common difference of an arithmetic sequence given that a₁= -5 and a₁₀= -2.75.