exam Maths Puzzle Numerical Ability

Help me slove..." The diagonals of a parallelogram bisect each other."

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exam Other Question

Write each equation in the form y = a(x-h)2 + k:

y = 2x2 + 20x + 50 How many pounds of walnuts which cost $4 per pound must be mixed with 25 pounds of almonds which cost $7.50 per pound to make a mixture which will cost $6.50 per pound?