book Maths Puzzle Numerical Ability

Please help with impossible money question: An investor placed a total of $10,000 in two simple interest accounts. One account earned a simple interest rate of 6.7%, and the othe

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please help me solve the following quadratic equations by factorisation;
1.3x^2+11x-4=0
2.x^2+5x-6=0
3.4x^2+14x+6=0
4.3x^2-5x-2=0
5.3x^2-5x+2=0
6.5x^2-14x-3=0 4[and then then the square root sign and then on the inside of that] 363