exam Maths Puzzle Numerical Ability

What is xy + 5 = y - 7 solving for y

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exam Other Question

Problem: "Find the products by using scalar multiplication".

A: -2 times [2 -4]
[-6 8]

B: 1/2 times [-2 -4]
[6 8]

I dont kno if its righ
Please help me with this algebra problem. It states:
If a probasketball plaer has a vertical leap of about 25 inches, what is his hang time? Use the hang-time function V=48T^2.

Please help solve. Thanks.