Question: y = 3cos[6(x-4)] - 5
Answer: 3
Explanation:
The reason for this is in order to find amplitude, it's always the number before "cos" or "sin". Also, the "[6(x-4)]" was just a distraction to throw you off
Here's a trick to find everything; amplitude, period, phase sift, etc.:
y = A sin(B(x + C)) + D
* amplitude is A
* period is 2π/B
* phase shift is C (positive is to the left)
* vertical shift is D