exam Maths Puzzle Numerical Ability

Use substitution or elimination to solve each system of equations. Please explain.

7. 2x + 5y=16
5x - 2y= 11

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exam Other Question

Please help me solve this problem. It says to simplify:(3x^3y^-4)^3 A type of steel sheet weighs 3.125 lb per square foot. What is the weight of a piece measuring 24 in. by 108in.? (Hint: Be careful of units.)