Which of the following problem situations does not describe a rate of change of 20 miles per gallon? A. Darryl uses 12 gallons of gasoline to drive 240 miles.
B. Ramona drives 40 miles on 2 gallons of gasoline.
C. Shelley travels 375 miles on 15 gallons of gasoline.
D. Amber uses 1.2 gallons of gasoline to travel 24 miles.

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.