180 degrees means that the new x=-x and the new y=-y so 
x=3 and y=-5 is orignal
new is -3 and 5
so new oint is
A(-3,5)
        
             
        
        
        
Answer:
Total pencils: 17
Total rulers: 15
Step-by-step explanation:
"I will buy 15 pencils."
15 * 8p = £1.20
15 pencils
"Then I will buy as many rulers as possible."
£5 - £1.20 = £3.80
£3.80/30p = 12 remainder 20p
12 rulers
"With my change, I will buy more pencils.”
20p/8p = 2 remainder 4 p
2 pencils
Total pencils: 17
Total rulers: 15
 
        
             
        
        
        
-5.8 + (-2.5) = -8.3
since both the number are negative you simply add the numbers and use the negative sign.
 
        
             
        
        
        
Find the common denominator for both unlike fractions.
EX:   1                        2
         12                      8
The lowest common factor is both fractions is 24.           Multiply both denominators to get 24. 
Do not forget to multiply the numerators with the number you used to multiply the denominators together.        
You do not have to multiply each side by the same number.
 
        
             
        
        
        
No they are not equivalent and if you are trying to get a mixed number try dividing