A) 4 cm
B) 9 cm x 12 cm
C) 108 cm
        
             
        
        
        
The formula to find the amount is 
here A is amount
P is the principal
'r' is the rate of interest
n is the number of years.
Case 1.
Stevan invests
P =$ 20,000
r = 3% = 0.03
n = 10 years
Hence the interest earned 
= A - P = 26878.33 - 20000 = $6878.33
Case 2.
Evan invests 
P = $10,000
r = 7% = 0.07
n = 7 years
Hence the interest earned 
= A - P = 16057.81 - 10000 = 6057.81
Difference in the interest = 6878.33 - 6057.81 = $820.52 
Rounded to the nearest dollar difference in interest = $821
 
        
             
        
        
        
Answer:
C 64 students have half the height
 
        
             
        
        
        
The answer is actually D. Since 2.5 is a side of each tiny block, there is 3 sides that you are going to multiply together. There is 5,2 and 4 because we are multiplying the length,width and side. So the length is 2.5*5=12.5 which was correct. The width is 2.5*4=10 which you had but you crossed it out. Then lastly you are looking for the side of the shape. 2.5*2=5. Now that I have everything I just need to multiply everything together. 12.5*10*5=625 in³. I hope this helped you!