When the equation f(x)=cos x is changed to g(x)=1/3cos x , what impact does this have on the graph?

Question

Describe the key features that change (amplitude, period, or midline).

Choices:

1. The graph is "compacted or shrunk" vertically; the amplitude changes from 1 to 1/3 
2. The graph is "stretched" vertically; the amplitude changes from 1 to 3 
3. The graph is "stretched" vertically; the amplitude changes from 3 to 1
4. The graph is "compacted or shrunk" vertically; the amplitude changes from 1/3 to 1

Answer 1

1. The graph is "compacted or shrunk" vertically; the amplitude changes from 1 to 1/3