Equation solved by a student has been given as,

Solution in each step,
Step 1 → 
Step 2 → 
Step 3 → 
Step 4 → 
In step 2, addition of two terms have been done → 
Therefore, property used to reach at step 2 → Addition property of equality
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Answer:
Area= 159.5
Step-by-step explanation:
31^2-29^2=sqrt 120 or approx. 11
29*11=319
319/2 = 159.5
Answer :
D
Explanation :
the slope is positive and is equal to 2/3 and the y-int is equal to 1/5
The answer is 1 and 5/12. Hope I helped!