What is the amplitude of g (x) = 8cos (5πx+3π/2) - 9

8

Step-by-step explanation:

The value of the amplitude is always positive and it tends to be number in front of the cosine function so for example by using the form 'a. cos (bx - c) + d', we can know that the amplitude is the number in front of the function so its 'a'