They're just after some straightforward algebra starting from the Law of Cosine. We don't have to evaluate any trig functions or anything like that.
We move the c² and the cosine term to their other sides,
That's it for the algebra.
a,b and c are the side lengths opposite A,B and C respectively. So a=4, b=5, c=2.
We substitute:
Answer: A. 37
Answer: About 32% of the average adult female body is made out of water.
Step-by-step explanation:
According to the data given in the exercise of the body of an average adult female is made out of water.
Then, you need to convert from fraction to percent. The steps are:
1. Divide the numerator of the fraction (In this case the numerator is 8) by the denominator of the fraction (In this case the denominator is 25). Then:
2. Multiply the result 0.32 by 100:
Therefore, about 32% of the average adult female body is made out of water.