I need help on doing this problem.

The domain of the function is ________

If you can't view the picture of the problem here it is: 1/squareroot(19x+3)

I also need help with this problem:

A company that makes thing-a-ma-bobs has a start up cost of $ 46975. It costs the company $ 1.09 to make each thing-a-ma-bob and the company charges $ 5.93 for each thing-a-ma-bob. Let represent the number of thing-a-ma-bobs made.

Write the cost function for this company. C(x)=____

Write the revenue function for this company.R(x)=____

Write the profit function for this company.P(x)=R(x)-C(x)=____

What is the minimum number of thing-a-ma-bobs that the company must pruduce and sell to make a profit?