In problems 3-6, find the slope msec of the se- cant line through the two given points and then lim Msec. calculate mtan 3. f(x) = x (a) (-2,4), (-2+h, (-2+ h)2) (b) (0.5,0.25), (0.5+h, (0.5+ h)) 4. f(x) = 3 + x (a) (1,4), (1+h, 3+ (1 + h)) (b) (x,3+x), (x+h, 3+ (x + h)) 5. (x) = 7x x (a) (1,6), (1+h, 7(1h) (1+h)2) (b) (x,7x-x2), (x+h, 7(x + h) - (x + h))