exam Maths Puzzle Numerical Ability

Find the indicated root
121m8n4

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exam Other Question

In one year, Cholena Youngblood earned the same amount of interest from an investment at 8%annual interest as an investment at 12% percent annual interest.She had invested $1500 more at 8%.How much money did she invest at 12%. I need so help with this problem.
given that (3x-a)(x-2)(x-7)=3x^3-32x^2+81x-70 what is the value of a?