exam Maths Puzzle Numerical Ability

Sketch a graph of the trigonometric function

f(x) = 2 sin (3x - pi/2) +2

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exam Other Question

The corner section of a football stadium has 15 seats in the first row and 40 rows in all. Each sucessive row contains 2 additional seats. Howmany total seats are in this section? What expressions represents the product of 3 less than twice x and 2 more than the quantity 3 times x? Please show me how to figure this out.
Thanks,
Joyce Moore