For a carnival game, containers are arranged in a triangular display. the top row has 1 container. the second row has 2 container. the third row has 3 containers. the pattern continues until the bottom row, which has 10 containers. a contestant knocks down 29 containers on the first throw. how many containers remain?

Is the figure congruent? yes or no?

Precalculus question, image attached.

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image