exam Maths Puzzle Numerical Ability

Multiply the following fractions.

X^2 - 3x - 10/5x * 15x^2/3x- 15

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exam Other Question

A sum of $3500 is split between two investments, one paying 9% yearly interest and the other 11%. If the total yearly interest amounted to $354, how much was invested at each rate? I need help with solving this exponential equation

(6/27)x+1 =(3/4)x-1