Answer:
a) x = 2, y = 1
b) x = 9, y = -9
Step-by-step explanation:
a)      
 
    ⇒ 
    ⇒ 
and 
       
   ⇒ 
   ⇒ 
By solving the above two equations, we get;
x = 2 and y = 1
b)     
    ⇒ 
    ⇒ 
and
        
    ⇒ 
    ⇒ 
By solving the above two equations, we get;
x = 9 and y = -9
 
        
             
        
        
        
Answer:
1.4 × 10^-8
Step-by-step explanation:
The chip is 14  nanometers
14 * .000000001 
.000000014
Move the decimal 8 places to the right, because we need 1 number in front of the decimal for scientific notation.  The exponent will be -8 because  we moved it 8 places to the right
1.4 × 10^-8
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
the volume of a cylinder is given by: 

where r is the radius and h is the height.
and the surface area: 

the first term is the area of the circles and the second term is the area of the body. 
since "The number of volume of a cylinder is half of its number of the total surface area." we will have that: 

substitutig the equivalent expressions on each side: 

and we simplify and solve for the height (since is the value we don't know of the cylinder):

we substitute the value of the radius  , and we get:
, and we get: 

thus the volume is: 


 
        
                    
             
        
        
        
Andrea can cut 4 1/2 (or 4.5) inch pieces from her original piece. 
18/4 = 4.5
Hope this helps!