QUESTION 4 Let f (x) = sin (2x) + (V2) x be defined on [0, I]. Find the point of inflection of its graph y = f (x) . 05 x S n. QUESTION 5 Let f (x) = sin (2x) + (2)x be defined on [o, I]. Find all critical numbers of f in LO, ]. As your answer enter the sum of the critical points in decimal form with three significant digits after the decimal point. QUESTION 6 Let f(x) =x2e-x. Find the critical numbers of f. As your answer please input the sum of critical numbers. QUESTION 7 Let f(x) =x2e-X. Find its local extrema. As your answer please input local maximum value of f in decimal form with three significant digits after the decimal point