exam Maths Puzzle Numerical Ability

I am having problems with this solution:

Solve for x: log(x - 5) + log 4 = 2

Please help. Thanks
-Ryan

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exam Other Question

A small firm produces both AM and AM/FM car radios. The AM radios take 15 h to produce. The M/FM radios take 20 h. The # of production hours is limited to 300 h per week. The plant Given a= x(^1/2)-4x(^-1/2). What is the value of 1/a^-2???