1. Yusef is building a pyramid out of playing
cards in which each level is constructed with a
triangular arrangement of 3 playing cards. He
builds a pyramid that is 8 levels tall, with 23
triangular arrangements on the bottom level,
and each
succeeding level has 1 fewer triangular
arrangements than the level below it. Part of 3
levels of the pyramid is shown below. How many
triangular arrangements are in the top level of the
pyramid?
A. 14
B. 15
C. 16
D. 30

This graph represents four ecosystems. each ecosystem has a different number of species, adding to its biodiversity. different colors represent different species. which statements correctly summarize the data depicted by the graph? 1. ecosystem d has more biodiversity than ecosystem c. 2. ecosystem b has more biodiversity than all the other ecosystems. 3. ecosystem a has more biodiversity than ecosystem b but less biodiversity than ecosystem c. 4. ecosystem b has more biodiversity than ecosystems c and d but less biodiversity than ecosystem a. 5. ecosystem a has more biodiversity than ecosystem c but less biodiversity than ecosystem b.