exam Maths Puzzle Numerical Ability

the problem i that I need help is the following:
-2 7/10 / (-1 1/14)

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exam Other Question

A teacher bases her class grade on four exams @100 pts. each. George has taken 3 exams with an average grade of 87%. What does he need on his fourth exam, to give him a final grade of 90%?
I have no idea. Please help!! What is the last operation that takes place in evaluating -1^6?
a. Parentheses
b. Addition
c. Subtraction
d. Exponents