book Maths Puzzle Numerical Ability

21x(squared) -17x + 2

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book Other Question

what is the slope of the line whose equation is 4x+5y=10
I think that the answer is -4/5
Is that right?
Thanks you so much for helping me! I really appreciate it.
An individual has a total of $1000 in 2 banks. The first bank pays 8% a year and second pays 10% per year. If the person receives $86 interest in the first year, how much money m