Answer:
Your answer should be $29.40
Step-by-step explanation:
If you divide 21 by 5 you get 4.2, so each book costs $4.20. 
4.2 x 7 = 29.4
Therefore, your total cost for 7 books will be $29.40
I hope this helps!
 
        
             
        
        
        
Answer:
Cost of 72 ounces of grapes is $13.5
Step-by-step explanation:
In order to solve his problem, we first need to get all the values in the same units.
   1 pound = 16 ounces
∴ 6 pounds= 16×6 = 96 ounces
Now by unitary method, we solve the question as follows:
price of 96 ounces of grapes = $ 18
price of 1 ounce of grapes = $ (18÷96)
∴ price of 72 ounces of grapes = $ [(18÷96)×72] 
= (0.1875×72) =  $ 13.5
 
        
             
        
        
        
Answer:
A
Step-by-step explanation:
Given
4n² + 4(4m³ + 4n² ) ← distribute terms in parenthesis by 4
= 4n² + 16m³ + 16n² ← collect like terms
= (4n² + 16n²) + 16m³ 
= 20n² + 16m³ 
= 16m³ + 20n² ← in standard form → A
 
        
             
        
        
        
Step-by-step explanation:
Circumference of a circle is 2piR
Here R is 3 cm
So C=2pi(3)
C=6pi cm
 
        
             
        
        
        
Answer: Hahahhahahaha
Explanation:
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