exam Maths Puzzle Numerical Ability

solve algebraically:
log base 2(3x+2) - log base 4(x)=3

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exam Other Question

Allen bought 20 stamps at the post office in 37 cents and 20 cents denominations. If the total cost of the stamps was $7.06, how many 37 cent stamps did Allen buy? Solve:
a) (2^x)^2-(3*(2)^x)+2=0
b) (9)(^2x)-(2*(9)^x)-3=0