Answer:
the answer is the last option! 68/5 - 22/5 = 9 and 1/5
Step-by-step explanation:
129.99*0.13
129.99-16.90
113.09*0.05
5.65+113.09
118.74
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 .
I think it is the 3rd one but I might be wrong...