Use the law of cosines to find the value of cos. round your answer to two decimal places

A. 0.21

Step-by-step explanation:

We have been given a triangle and we are asked to find the value of cos using law of cosines.  

Law of cosines:

Upon substituting our given values in above formula we will get,

Upon rounding our answer to nearest hundredth we will get,

Therefore, the value of is 0.21 and option A is the correct choice.

a

step-by-step explanation:

when a number is between two straight lines it means the absolute value.

to find absolute value you need to know how many numbers is that number away from 0.

when finding absolute value the number will always come out positive

so absolute value of -3 is 3

absolute value of 3/2 is 3/2

absolute value of -2 is 2

absolute value of 3.5 is 3.5

absolute value of -1 is 1

now put these numbers in order:

a)   |-1|, |3/2|, |-2|, |-3|, |3.5|