10 points. is this the right formula for pi? example: diameter: 6, that makes the radius 3. radius x itself. 3 x 3 = 9. 9 x 3.14 = 28.26 = area of the circle. i kinda need to know asap cause i have a unit test today : -:

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?

Brent wants to know what is 5 x 1/2

Δabc is dilated by a scale factor of 3 with the origin as the center of dilation to form δa′b′c′. the slope of is -1.2. the length of is p units, the length of is q units, and the length of is r units. the slope of is . the length of is units.