A. 1/7

B. 1/28

C. 1/14

D. 1/56

The angle between the curves xy=4 and x^{2}-y^{2}=15 at the point (-4, -1) is

If the rate of change in y=2x^{3}+3x^{2}-30x+7 is 6 times the rate of change in x, then x=

If x is real, the maximum value of 3x^{2}+9x+17/3x^{2}-9x+17 is

If there is a possible error of 0.02 cm in the measurement of the diameter of a spare then the possible percentage error in its volume when the radius 10 cm is

The maximum value of x^{4}+3x^{3}-2x^{2}-9x+6 is