Answer:
b. 28.1
Step-by-step explanation:
By the property of intersecting secant and tangent out side of the circle.

Answer:
, 
Step-by-step explanation:
Give.
----------(1)
------------(2)
Solve this linear equation by elimination method.
Add equation 1 and 2


-----------------------------



Put y value in equation 2




, 
Do 91/7 (divide) and you will get your answer. So 91 divided by 7 is 13. Sylvia worked 13 hours that week in turn she earned $91
The answer is -8/3
Explanation: I used geogebra and made the slope, then calculated it