What is the domain of the profit P=6t + 10s

Ineed to know the answer to this algebra question.

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.