For the set of integers r, (r + 1), (r + 2), (r + 4), (r + 7) and (r + 10), find the terms of r, an expression for a) the median
b) the mean
Hence, find the value of r if the mean is twice the median

I'll give 80 points if you answered correctly with working steps

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15