Atrapezoid has an area of 935 square centimeters and the bases measure 30cm and 55cm. what is the height?

What is the difference between regular convex and concave polygons

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab