book Maths Puzzle Numerical Ability

x^2 + 2x - 15 = 0

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book Other Question

2 investments made produce an annual income of $4200.amount invested at 14% is $6000 less tha amount invested at 10%. find amount invested at 14% The local sandwich shop has 3 cash registers. In howmany possible ways can 4 customers lineup at the registers?