What do you need help with?
Answer: The combined expressions are
f(x)= x cos (x)
hope it helps :)
Step-by-step explanation:
Answer: 0.75 minutes per lap
Explanation:
When the length of sides are given, you can use law of cosine to find the angles
Refer to this website for details
https://www.mathsisfun.com/algebra/trig-cosine-law.html
11^=8^2+5^2-2*8*5cosA
-80cosA=32
cosA=-0.4
A is about 114 degree
use the same method to find out B and C, you will get 42 and 25
