Yvaries directly with x, and y = 15 when x = 3. what is the value of x when y = 4?

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?

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

If there are 3.281 feet in 1 meter, how many inches are in one centimeter