Hey You! 
The images are blurry and I cannot make out most of the questions. I'll solve as many as I can see! 
27. ANSWER: 
Students A and D have a combined score of 0 because 4 + -4 = 0
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28. SOLUTION/ANSWER: 
STEP 1: 12.40 - 0.72 = 11.68
STEP 2: 11.68/2 = 5.84
Answer: Each souvenir cost $5.84.
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29. SOLUTION/ANSWER: 
(-68) - 214 = -282
Answer: The lowest elevation in California is -282 feet. 
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33. SOLUTION/ANSWER: 
60/3 = 20 
Answer: The diver's change in depth was -20 per min.
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34. SOLUTION/ANSWER: 
-43 - (-34) = -9. The difference between the two is -9. 
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35. SOLUTION/ANSWER: 
-64.4 + (3.22) = -67.62
Answer: Equals -67.62
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37. SOLUTION/ANSWER: 
3.375 = 3 3/8 as a mixed number and 27/8 as an improper fraction.
Answer: 3 3/8 (or 27/8).
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38. SOLUTION/ANSWER: 
3 ÷ 5 = 0.6
5 + 0.6 = 5.6
Answer: 5 3/5 = 5.6 
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39. SOLUTION/ANSWER: 
1.5 + 2.8 = 4.3
Haley jogged 4.3 km that day.
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I cannot see the other questions. If you can perhaps message them to me I can try to help you! :)
        
             
        
        
        
Answer:
5th example: 28 blocks. 
24th example: 123 blocks.
Step-by-step explanation:
Hope this helped!
 
        
             
        
        
        
Answer:
8times 10 times 4 divided by 2 pplus 8 times 8 equals 64 + 80 = 144 m squared
Step-by-step explanation:
 
        
                    
             
        
        
        
Since BC is the hypotenuse... 
α = 12 
 c = 13 
 Hence.. 
 13² = 12² + ß² 
ß = √(13² - 12²) 
 = √(169 - 144) 
 = √25 
 = 5 
 Hence, AB = 5 
 I hope this helps!