What times what equals 21 but adds up to -10

An astronaut drops a rock into a crater on the moon. the distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t)0.82. what is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped?

Find the greatest common factor of 28 and 35

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area