From the attached graph we can observe that: at zero, the value of the function is zero. It then rises to its maximum value which 5, then falls to zero and then to its minimum value which is -5 and then back to zero.
So, the graph follows the pattern of Sine Function: (B. zero-max-zero-min-zero) starting at the origin. This suggest the coefficient a of the sine function is positive.
Maximum value of the function as seen from the graph is 5, and the minimum value is -5. So the amplitude of the function is 5 and the vertical translation k = 0 as the graph rises equally above and below x-axis.
