Problem 4 For the following functions, determine all numbers 6 in the specified intervals such that x2 in [1,2] 2. 3. 4. 2 in [2,6] x I X 2 in [0, l] 9 in [0,4] Problem 5 Find the equation of the line through the point (5, l) a) parallel to the line y = 3x+ 7 b) perpendicular to that line. Problem 6 Find the equation of the line perpendicular to the line ax + by = c which passes through the point (a, 13). Assume that 0, b 0.