exam Maths Puzzle Numerical Ability

Solve: ln 4 + ln x = 3.

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exam Other Question

Can you help me solve this problem?

Add.
(3r^4-2r^3+2r^2+10r-4)+(r^5+9r^3+5r^2-2r-2)+(-6r^4+r^2-6r-9)

I would really appreciate an explanation on how to solve this problem. Thank you so much for your help once again. how do you get y by itself