book Maths Puzzle Numerical Ability

I am not sure how to solve this one

ln (square root of x +4) =1

and

log base 2 (x-3) + log base 2x - log base 2 (x+2) =2

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book Other Question

A comet follows a hyperbolic path about the focus of the Sun. The equation of the orbit is x squared/80 squared minus y squared/ 150 squared = 1, where x and y are measured in Gm. how far from the center of the hyperbola is the Sun. Hello,

How do you find where a liine intercepts another point on a graph.

For example:

Line y=2/3x+13.5 and Line y=-1/2x+3

where do they intersect?

thank you