I don't see a mistake. You solve in parentheses first, then you solve exponents. If the exponent is 0 in this context, the answer would be 0.
        
                    
             
        
        
        
From the identity,
sin^2(x)+cos^2(x)=1
then 
cos(x)=sqrt(1-sin^2(x))
where sin(x) is given as 0.42.
Note that the above answer applies to 0<x<90 degrees
        
             
        
        
        
<h2>
Answer:</h2>
C = 2πr
r = C/2π ...(1)
A = πr²
A = π(C/2π)² = πC²/4π²
A = C²/4π.
<u>Correct choice</u> - [A] A = C²/4π.
 
        
        
        
Answer:
Option 4
Step-by-step explanation:
y = -5x + 2
-8 = -5(2) + 2
-8 = -10 + 2
Correct! :)
 
        
             
        
        
        
Answer: x = 6V/bh
Explanation:
V = 1/6 bhx 
V = (bh/6)x
V • 6/bh = x
6V/bh = x