exam Maths Puzzle Numerical Ability

-3-(7)/3-5 is the question. i am haveing trouble with the positive and negative. when you add and subtract and when it becomes multiplacation

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exam Other Question

Determine the equation of the line.
The Line is parallel to the x-axis and passes through the point (1/5, -4)
If a pro-basketball player has a vertical leap of about 30 inches, what is his hang time? Use the hang time function? V = 48T^2

I come up with 5 seconds, would that be correct?