exam Maths Puzzle Numerical Ability

How do you solve 3log base 7 + 2log base 8? As of right now I have switched to log base 7 x^3 + log base 8 x^2. Then I changed that to (log x^3/log 7) + (log x^2/log 8)
After that

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exam Other Question
you have $50,000 to invest, you invest some at 5% and the rest at 4%. you earn $2100 in annual interest, how much did you invest at each rate? a) y^2-11y+28
b) 4x^2-11x+6