Without Graphing the Function, Determine Its Amplitude or Period as Requested

question 220

Multiple Choice

Without graphing the function, determine its amplitude or period as requested.
- $y = - 4 \cos \frac { 1 } { 3 } x \quad$ Find the amplitude.

• A) \(\frac { 4 \pi } { 3 }\)
• B) 4
• C) \(\frac { \pi } { 4 }\)
• D) \(6 \pi\)