exam Maths Puzzle Numerical Ability

please help me....i thought the answer that i've got in this problem is incorrect...help me please...


Factor:

y^2-4+y^4+8y

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exam Other Question

An airplane flies 1,000 due east in 2 hours and 1,000 due south in 3 hours. What is the average speed of the airplane?
This is what I did:

((1,000/2)+(1,000/3))/2
The function H described by H(x) = 2.75x + 71.48cm can be used to predict the height, in centimeters, of a woman whose humerus is x cm long. Predict the height of a woman whose humerus is 33 cm long.
Height =_____cm.