exam Maths Puzzle Numerical Ability

Solve the system of equations using matrices and identify the soluation
2x-3y+11z=10
-2x+2y-7z=6

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Q26

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exam Other Question

I have several word problems to solve but this is the first one. John owns a hotdog stand. His profit is represented by the equation P(x)=-x^2+12x+46, with P being profits and the x the number of hotdogs sold. What is the most he can earn? All variables are real numbers - express in simplified form

square root of 14xy^2 multiplied by the square root of 3xy^3