Answer:
56.556 square inches 
Step-by-step explanation:
Surface area of an open cylindrical pipe is = πdh
3.142 × 1 × 18 = 56.556 
 
        
             
        
        
        
Answer:
70
Step-by-step explanation:
Complementary angles equal 90 degrees
90 - 20 = 70 
I hope this helps!
 
        
             
        
        
        
Answer:
-y^4+4y
Step-by-step explanation:
 
        
             
        
        
        
Answer:
<em>Last option </em>

Step-by-step explanation:
The general sine function has the following form  

Where A is the amplitude: half the vertical distance between the highest peak and the lowest peak of the wave.  
 is the period: time it takes the wave to complete a cycle.
 is the period: time it takes the wave to complete a cycle.
k is the vertical displacement.
 phase shift
 phase shift
We know that:
amplitude: 1; period: 2; phase shift: 3; vertical shift: 4
Thus:





Then the function is:

The answer is last option 
 
        
             
        
        
        
Answer:
Add them up so ur answer can be right