book Maths Puzzle Numerical Ability

How do you change 28/9 to a mixed or whole number.

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book Other Question

graph y=3sinx and y=sin 3x on the same axes. label the graph of each function.

I know the amp. of first function is 3 and period is 2pi and for second function amp. is 1 and period is 2pi/3 i just dont know how to graph how do you evaluate this expression.3*2+5/9