Algebra PYQ

If f(x) = 2x + 3, then f⁻¹(x) is:

If the roots of the equation x² - 5x + k = 0 are in the ratio 2:3, then the value of k is:

If f(x) = x² + 2x + 1, then f(3) equals

The number of ways to arrange the letters of the word "COMMITTEE" is:

The 10th term of AP: 3, 7, 11, 15, ... is