exam Maths Puzzle Numerical Ability

please help me solve this equation: logx base 2 + log2 base x=2

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exam Other Question

Triangle ABC is isosceles with AC=BC; BD is the medion to side AC...

If DB is 2 cm greater than DC and the peremiter of triangle BDC is 70 cm, find BC.

We are supposed to be Is Y a function of d? Is d a function of y?
y 1993 94 95 96 97 98
d $2 $4 $3 $-2 $5 $2