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6-141.

$\text{amplitude}=\frac{\text{max }-\text{ min}}{2}$

Vertical shift: Since the minimum point is at y = 2 and the amplitude is 1.5, the vertical shift would be their sum.

Horizontal shift: Since the maximum point is at (2, 5) a cosine function has been shifted 2 units right.

Since a maximum is at x = 2 and a minimum is at x = 4, half of a cycle is 2 units. Hence, the period is 4.
Use the formula pb = 2π to calculate b.