Answer: 
<u>Step-by-step explanation:</u>
Note the following identities: tan² x = sec²x - 1

tan² x + sec x = 1
(sec² x -1) + sec x = 1
sec² x + sec x - 2 = 0
(sec x + 2)(sec x - 1) = 0
sec x + 2 = 0 sec x - 1 = 0
sec x = -2 sec x = 1

Answer: Bea has $30 saved
Step-by-step explanation:
Add 10: 50+10=60
Divide by 2: 60/2=30
Answer:
36=2x-6
Step-by-step explanation:
36=total
2x= Trina
6= Rachel
Answer:
See Explanation
Step-by-step explanation:
<em>The question is incomplete as the image that illustrates the scenario is not given.</em>
<em>However, I can deduce that the question is about a right-angled triangle.</em>
<em>So, I will give a general explanation on how to find each of the side of the triangle, given a side and an angle.</em>
<em />
<u>For triangle A (solve for b)</u>
Using cosine formula.


Make b the subject

<u>For triangle B (solve for b)</u>
Using cosine formula.


Make b the subject

<u>For triangle C (solve for b)</u>
Using cosine formula.


Make b the subject
