exam Maths Puzzle Numerical Ability

Sketch one cycle of the curve

y = -sin(x/2)

Give the period, amplitude and phase shift

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Hi I need help I have no Idea how to solve these problems or what steps to take it seems easy but I dont know what Im doing please help me.

An example of a queshtion is Find thee consecutive odd integers whose sum is 117.
Thanks Dominik How many integers in the set of all integers from 1 to 100, inclusive, are not the square of an integer?