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Q7. a. Give H = 2 + x/4 + 512/x² ,where x > 0, calculate EACH of the following:

i. The value of x such that H has a minimum value (6)

ii The minimum value H. (2)

b. A = 75t^0.4 + 60√t - 25/t

Determine EACH of the following:

i. dA/dt (4)

ii. d²A/dt² (4)