For each of the following functions: i) Determine its concavity (up or down), ii) the maximum or minimum value, iii) the quadrant in which the maximum or minimum occurs, and iv) the intervals of increase/decrease. a) h(x) = x + 2 b) g(x) = x-2x-8 c) f(x)=(x+2) d) d(x)=-3x+4x-7