The exponential function \( c(x) = 150 \cdot 4^x \) represents growth.
Here's why:
- The base of the exponential term, 4, is greater than 1.
- In exponential functions, when the base is greater than 1, the function represents growth.
- As the value of \( x \) increases, the function \( c(x) \) will increase exponentially, indicating growth.