book Maths Puzzle Numerical Ability

I need help with four problems: I need to write a variable expression for each word phrase:
Problem 1: five less than y
Problem 2:the product of a number and 78
Problem 3:the quotient of a number and 9
Problem 4:ten increased by a number

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book Other Question

log2 16 = 8.2 (exp -x), then x=


a) -7 b) -4/3 c) -1 d) -2/3 e) 1

exponent is -x in the 8.2 problem
what is the square root of 9a^2b^6?