For the given claim, complete parts (a) and (b) below.

Claim: High school teachers have incomes with a standard deviation that is more than $19, 250. A recent study of 149 high school teacher incomes showed a standard deviation of $21,250.

a. Express the original claim in symbolic form.

b. Identify the null and the alternative hypotheses that should be used to arrive at a conclusion that supports the claim: H0: ___ ___ H1:___ ___ ___

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.