Craig wants to prove that if ABCD had diagonals that bisect each other then it is a parallelogram. Craig says “I can prove that AB ||CD by establishing the congruence of a single pair of triangles.”

Which pair of triangles is Craig referring to, and which criterion should he use for establishing congruence?

A. ABC and CDA by angle side angle
B. ABC and CDA by side angle side
C. ABE and CDE by angle side angle
D. ABE and CDE by side angle side

PLEASE HELP! I am really struggling with this!!!
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The biologist has a second culture to examine. she knows that the population of the culture doubles every 15 minutes. after 1 hour and 15 minutes, her assistant found that 80,000 bacteria were present. a) what was the size of the initial population? b) predict the size of the culture at t=3 hours. what was the size of the population at 40 minutes? explain and justify your answers. c) create a graph of the population as a function of time. find an equation that can be used to predict the size of the population at any time t. d) examine the rate at which the bacteria culture is growing. how fast is the culture growing after 1 hour? after 1.5 hours? after 2 hours? use a time interval of h = 0.01 hours to estimate these rates. interpret these rates in terms of the context of the problem situation. how do these three rates compare?