Identify the common difference of an arithmetic sequence given that a₁=10 and a₂₀=200.

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

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

Identify the common difference of an arithmetic sequence given that a₁ = 3 and a₅ = 11.

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

Find the mean of the first 5 even numbers.

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

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

Identify the common difference of an arithmetic sequence given that a₁=5 and a₁₅=75.

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