exam Maths Puzzle Numerical Ability

can somone plese help me solve this?
log(9, sqrt x ) + log(9, sqrt 2x+3)=1/2

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exam Other Question

wich number is a prime number
1
12
31
99 I have no clue as to what I am doing. Please help. The picture that is with this is of a rectangular cubed box and on one of the sides it has this next to it: x + 2 .
Geometry.