Solution: The missing reason in Step 8 is substitution of 
.
Explanation:
The given steps are used to prove the formula for law of cosines.
From step 5 it is noticed that our equation is
..... (1)
From step 7 it is noticed that the value of 
is 
.
So by substituting for in equation (1) we get the equation of step 8, i.e.,
Hence, the missing reason in Step 8 is substitution of .
Answer:
42/6 or 7
Step-by-step explanation:
Answer:
4 minus a number times three
If you know that b=0, then ab=bc doesn't tell you anything about
'a' or 'c', because no matter what they are, it's always true.
6 2/3 ÷ 1/5 = 62/15
62/15=60 2/15
60 2/15 is your answer.
Hoped I helped!
