Five books and four pens cost $800. One book costs $120. How much does one pen cost?

For what values of b will f(x)= logbx be a decreasing function? (16 )

1/3(x-10)=-4 solve for x with steps

The clayton family’s pool has vertices at the coordinates (0, 2), (0, 5), (2, 5), (2, 6), (5, 6), (5, 1), (2, 1), and (2, 2). if each grid square has an area of 9 square feet, what is the area of the pool?