exam Maths Puzzle Numerical Ability

What is the inverse of the function y=logbase2 x?

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exam Other Question

Martha and Sally had lunch together on Tuesday. Sally paid $2 more than Martha. If the total bill was $5.64, how much did Sally pay for her lunch?

a. $1.82
b. $2.00
c. $3.64
d. $3.82
e. $7.64 7-1/t=6/t^2