book Maths Puzzle Numerical Ability

a+b=10.6
a+c=8.5
b+c=8.1
how much are a, b, c worth?

Please help .8th grade

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book Other Question

use long division to divide the following polynomials:
1) divide 3x^4-7x^2+2x-10 by x-3
2) divide 6x^4+20x^3+13x^2-5x+2 by 2x^2-1
3) divide 4x+y by 3x-2
4) divide x^3-11 by x^2 I need to know how to solve (5x-2)(5x+2) and to show my work too.