7.5.2.1. choose two cards to make a square number. you may use each card/ digit only 1 time

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?

Graph y = -|x| + 2. click on the graph until the correct one appears.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?