If a dozen people get on a train, and five of them get off at the next stop, how many of those people are left on the train?

How many days was the temperature above 90 degrees?

Find dy/dx using implicit differentiation ln(20+e^xy)=y

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?