Answer:
It would be 14 because since each book is 3.5cm thick times that by 4 and get 14.
Five grams is equal to 1 teaspoon
Answer:
The answer to your question is Area = 62.5 u²
Step-by-step explanation:
Area = 
a and b are bases
c = heigth
dAD = 
dAD = 
dAD = 
dAD = 
dAD = 
dAD = 20 u
dBC = 
dBC = 
dBC = 
dBC = 5 u
dAB = 
dAB = 
dAB = 
dAB = 
dAB = 5u
Area = 
Area = 
Area = 5(12.5)
Area = 62.5 u²