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) 12 (3) 60
(2) 20 (4) 80

answer: idk

step-by-step explanation:

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b