The circumference of a circle can be found using the equation 2 π r
(2)(3.14)(4.5) = 28.26   (or 28 13/50 if you need it in fractions)
        
             
        
        
        
Answer:
48
Step-by-step explanation:
 
        
             
        
        
        
Answer:
625
Step-by-step explanation:
1. parenthesis first, so it simplifies to ((6+(8)2÷4*1)/2)^4
2. pemdas says that multiplication and division go before addition and subtraction, so ((6+(8)2÷4*1)/2)^4 becomes ((6+16÷4*1)/2)^4 ---> ((6+4)/2)^4 
3. then simplify inside of the parenthesis, so it becomes 5^4, which is 625
 
        
             
        
        
        
Answer:
A. You would first plot the y intercept.  The first equation would be (0,-8) and the second equation is (0,-11).  Then you would plot the slope.  For the first equation, from (0,-8), you would move up 3 plots and right 1 plot.  For the second equation, from (0,-11), you would move up 9 plots and right 1 plot.
B. The solution to the pair of inequalities is (1/2, -13/2).  That is the intersection and point of the two lines.  You would need to graph the two lines (see part A answer) and then find the intersection.  
Hope this helps!