exam Maths Puzzle Numerical Ability

what is the difference between the words "exponent" and "power"

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sheila practiced 1 1/2 hours on monday, 3 3/4 hours on Tuesday, and 2 1/4 hours on Wed. What is the total number of hours that she practiced?

I got down to 30/4 = 7 2/4. But can I reduce it to 8 1/2 ? Sketch one cycle of the curve

y = sin 2(x + 3.14/4)

Give the period, amplitude and phase shift