1. 2. Let L be a common tangent line to the curves 4x +9y = 36 and (2x) +(2y) = 31. Then the square of the slope of the line L is........ If the arithmetic mean and geometric mean of the pth and qth terms of the sequence -16,8,-4,2,.... satisfy the equation 4x-9x + 5 = 0, then p + q is equation to.......... 3. The total number of 4-digit numbers whose greatest common divisor with 18 is 3, is........