An astronaut drops a rock off the edge of a cliff on the Moon. The distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t) = 0.8t^2 . What is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped? * 1 point
a) 12
b) 60
c) 20
d) 80

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4

Which shows a reasonable estimation for 124% of 42 using the distributive property?