exam Maths Puzzle Numerical Ability

consider the sequence -1, 2 , -3 , 4 , -5 ,. . . . -299, 300 . what is the average of this sequence of 300 numbers ?

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exam Other Question

Sketch the following function
f(x)= -x squared + 4 and
label
max or min points with appropriate coordinates
y intercept
x intercept if any
describe mathematically how the graph transformed from f(x) = x squared How do I express his product in the simplest form?

a(squared)-b(squared) over a(to the fourth power)b times ab(b is squared) over 3a+3b