4. [2.4) Determine the locations at which the line tangent to the curve is horizontal. x2 - x - 10 y = x+3 5. [2.5] The position function s(t) = v2t2 + 3t represents an object moving along a straight line. Determine the velocity at 1 second. Leave your answer in exact form. 6. [2.5] Consider a triple composite function: (f . g . h)(x) = f (g(h(x))) Differentiate this function