Finding maximum/minimum values?

[eleventhxhour]

What are the maximum/minimum values for y = 28(1.21)^x on the interval 0 $\le$ x $\le$ 12?

I think that the minimum value might be 28 because y = 28 when x = 0 but I don't know how to find the maximum value. Could someone help/explain? Thanks.

 

[MarkFL]

An exponential function, whose base $b$ is greater than 1, of the form:

$$y=kb^x$$ where $0<k$ will be monotonically increasing on any interval within the domain, which is all reals. Thus, the function will have it's minimum at the left-endpoint and its maximum at the right end-point.