If e varies directly as n and e/d = 10, then what is the value of e when d = 30?

If a₁=1 and a_n+1-3a_n+2 = 4n for every positive integer n, then a₁₀₀ equals

If 3x – 5y = 5 and x/x + y = 5/7, then what is the value of x – y ?

Solve the following equation 3s + 5 = s – 1

The number of non-negative real roots of 2x – x – 1 = 0 equals

If x = 3 –  √5 , then the value of x²+16/x² is equal to

If a - 4 = 4 (2- a), then what is the value of a?

If 2x + 3y -31, y – z - 4 and x + 2z – 11, then what is the value of x + y + z ?

If f (x+(y/8), x-(y/8)) = xy, then f (m, n) + f (n, m) = 0