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- .. . . 19. y is directly proportional to r and y = 35 when I = 5. Find the constant of proportionality. (a) 7 (b) 7 (c) 175 (d) 1 175 (e) None of these. 20. P varies jointly with z and y and inversely with the square of z. If P = -17/50 when I = 3, y = 17, and z = 10, find the equation relating the variables. (a) p -17(xty) (b) P = -86722 (c) P= Lay 10z2 5000ry 322. -1722 (d) P = 10(2 + y) (e) None of these. al. g(a) = a3 + 5a2 f(a) =2a +4 22. g(a) = 3a +3 f(a) =2a-2 Find g(3) + f(3) Find (g + f)(9) 23. g(1) = 2+3 24. g(2) = 4x +5 f(z) =-1+4 h(x) =x2+5x Find (9 - f)(3) Find g(x) . h(x) 25. f (t) = 4t + 3 g(t) =-4t -2 Find (fog)(t)