If two or more polygons are congruent, which statement must be true about the polygons? read all of the choices before deciding.
a) pairs of corresponding angles have the same measure.
b) pairs of corresponding sides have the same length.
c) the polygons are parallelograms.
d) the polygons are regular.
e) rigid transformations can be used to map one polygon onto the other.

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

Ineed i been stuck on this question since yesterday