exam Maths Puzzle Numerical Ability

It is in Chapter 5 section 2 Written Exercises #16.

Given: ABCD is a parallelogram.
W,X,Y,Z are midpoints of segments AO,BO,CO,DO.

Prove: WXYZ is a parallelogram.

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exam Other Question

Determine whether 3 is a solution of the equation 9 x +5 = 30

Again can someone help please? An investment of $12,000 is deposited into two simple interest accounts. On one account, the annual simple interest rate is 5.5%. On the other, the annual simple interst rate is