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## Homework Statement

Find any critical numbers of the function

## Homework Equations

g(t) = sqrt (4-t) , t < 3

## The Attempt at a Solution

I'm not really sure how to find a critical number when square roots are involved. I do know typically when finding the critical number you find the derivative of the equation and then set that equal to 0. However I ended up with the derivative dx = 4 sqrt (4-t) / 4-t. I tried setting that to 0 but got no where.