Find the maximum value of y in the equation y = 1 - 2x - 3x\(^2\)

If the 9th term of an A.P is five times the 5th term, find the relationship between a and d.

Make r subject of the formula given that \(\frac{x}{r+a}=\frac{a}{r}\)

The inverse function f(x) = 3x + 4 is

If -2 is the solution of the equation 2x + 1 - 3c = 2c + 3x - 7, find the value of c.