The solution set for the inequation 2x + 4 ≤ 14, x ∈ W is :

1. {1, 2, 3, 4, 5}

2. {0, 1, 2, 3, 4, 5}

3. {1, 2, 3, 4}

4. {0, 1, 2, 3, 4}

Find the value of 'a' if x - a is a factor of the polynomial 3x³ + x² - ax - 81.

In the given figure O, is the center of the circle. CE is a tangent to the circle at A. If ∠ABD = 26°, then find :

(a) ∠BDA

(b) ∠BAD

(c) ∠CAD

(d) ∠ODB

Solve the following quadratic equation :

x² + 4x - 8 = 0.

Give your answer correct to one decimal place.