Match the following reasons to complete the proof.
?2 and ?4 are vertical angles _______________________
(a) Given
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Solve the problem.In order to measure the distance across a pond (from A to B), Yuko made some measurements, which are given below the drawing. What is the distance (to the nearest unit)? src="https://sciemce.com/media/4/ppg__ttt0611191524__f1q304g6.jpg" alt="" style="vertical-align: -4.0px;" /> 
A. 125 yd
B. 173 yd
C. 157 yd
D. 138 yd
Use the determinant feature of a graphing calculator to solve the system by Cramer's rule . (Round to one decimal place.)2.2x + 14.0y + 2.9z = 4.63.6x - 7.0y - 0.6z = -4.53.4x + 16.7y + 4.9z = 11.5
A. {(-1.4, -0.5, 4.9)} B. {(3.4, 1.2, -12.3)} C. {(-5.6, -1.9, 20.1)} D. {(-2.0, -0.7, 7.4)}
Add or subtract as indicated.-6.1 - (-3.5)
A. -9.6 B. 9.6 C. 2.6 D. -2.6
Find the mean. Round to the nearest tenth when necessary.The numbers of calls from telemarketers Lori received over the last seven weeks were as follows: 16, 9, 7, 11, 7, 4, 4
A. Mean = 7.8 calls B. Mean = 9.7 calls C. Mean = 8.3 calls D. Mean = 9.8 calls