What is the probability that Glen will get a yellow marble?  Express answer as a percent. Probability is  calculated by creating a ratio and dividing the numerator by the denominator to create a decimal and then a percent.

For example:

2 cars are green and 3 cars are red.  What is the probability that the car that is chosen is red?

favorable (what you want picked)  = 2   = .4  =40%
         total  number of choices           5

Which of the following would be a correct step in proving that triangle abc is congruent to triangle cda? a. use a protractor to measure the angles and show that all the corresponding angles are equal in measure. this will allow you to prove congruence by aaa. b. show that segment ab is parallel to segment cd and segment ad is parallel to segment cb. this will allow you to prove congruency by asa. c. show that is segment ab is perpendicular to segment ad. this will allow you to prove congruence by sas. d. none of the above.