exam Maths Puzzle Numerical Ability

A chain store manager has been told by the main office that daily profit, P, is related to the number of clerks working that day, x, according to the equation P = -25x^2 + 300x. W

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8x+9y=1
-2x+6y=5 solve this matrix. I am the older sister, who hasnt done matrix stuff since high school. I am trying to remember how to solve this equation. can you please help. sorry i didnt try, i doont have a book or anything. IN NEED OF SOME HELP PLEASE. FIND THE INDICATED QUOTIENTS BY SYNTHETIC DIVISION. A. (X^3+6X^2-X-30)DIVIDED BY (X-2) B. (A^4-1 DIVEDED BY (A-1) SIMPLIFY THE GIVEN COMP