book Maths Puzzle Numerical Ability

how do you solve r+4/3 = r/5 ? and problems similar to that one?

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book Other Question
hilary is trying to determine the cost of health care to college students and parents' ability to cover those cost. She assumes that the cost of one year of health for a college s Can some one please help explain these in detail? I am so lost. Thank you

Factor completely:
9x^2 -16y^2

3x^2-2x-8

3x^2 + 12x +12

Thanks again for all your help!




Thank you