1. (a) Two numbers are in the ratio of 3 : 5. If 8 is added to each number, the ratio becomes 2 : 3. Find the numbers.   2. (b) A function 'f' is defined by f (x) = 144 − 16x2. Calculate f (2). Also find the value of x when f (x) = 0.   3. (c) Find the value of x, which satisfies the inequation: −2 ≤ 1 2 −  2x 3 ≤ 1 5 6 , x ∈ N. Graph the solution on the number line.