exam Maths Puzzle Numerical Ability

Combine like terms:
x + 6x2 - 4 - x2 - 3 + 9x + 8

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exam Other Question

solve for X

triangle DAB congruent to triangle ACB
AB=X ft. CD=18 ft. DB=32 ft. I dont understand this:

Kendra invested $850, part of it at 9% and part of it at 12%. If her interest for one year was $81 how much did she invest at each rate?