exam Maths Puzzle Numerical Ability

Logarithims

Please solve 2log(x)=log{3x/4}-1

Thanks in advance, this is not from a book.

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exam Other Question

Find the maximum value of C = x + 3y on the region determined by the constraints
{3x + 2y <= 16
{0<= x <= 4
{0<= y <= 5

Possible answers:

10
17
19
21 Help Needed

(b^2+12b+11)*b+9/b^2+20b+99