The answer is B.
I hope this helps!
        
             
        
        
        
Answer:
70%
Step-by-step explanation:
since 7/10 is 0.7 as a decimal
you can then turn it into a percent by moving the decimal point two spots to the right
70 --> 70%
another way to do it is, to add zeros on both the numerator and denominator
then it is valued at 70/100 
a percent is a number over 100
70 ---> 70%
your answer is 70% 
hope this helps
 
        
             
        
        
        
Answer:
There are 50 boys
Step-by-step explanation:
girls to boys - 2:4
so 25x2=50
 
        
             
        
        
        
Answer:
x = 33
Step-by-step explanation:
Two angles are complementary as the sum of two angles is 90
x + 24 + x = 90        {Combine like terms}
    2x + 24 = 90      {Subtract 24 from both sides}
           2x  = 90 - 24
          2x   = 66
           x   = 66/2
          x = 33
 
        
             
        
        
        
Answer:
A =  (Z-CD - EFG)/B
Step-by-step explanation:
AB + CD + EFG = Z.
Subtract CD and EFG from each side
AB + CD + EFG-CD -EFG = Z-CD - EFG
AB  = Z-CD - EFG
Divide each side by B
AB /B = (Z-CD - EFG)/B
A =  (Z-CD - EFG)/B