Which of the following are necessary when proving that the opposite sides of a parallelogram are congruent check all that apply.
A corresponding parts of congruent triangles are congruent.
B opposite sides are Parallel
C opposite sides are perpendicular
D corresponding parts of similar are similar

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.