Question

A certain cosine function has an amplitude of 7. Which function rule could model this situation?

Answer 1

y = 7cos bx

Explanation:

For a cosine function without pahse shift and vertical shift, but with amplitude given, it will also have period and thus , the formula for the cosine function is;

y = Acos bx

Where;

A is the amplitude

Period = 2π/b

Now, we are told that the amplitude is 7. Thus;

y = 7cos bx