book Maths Puzzle Numerical Ability

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

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book Other Question

The population of Mattville was 41,209 in 1984. If this population was 5015 less than twice tha population of Mattville in 1978, what was the population increase in those 6 years? 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