Letting 

, we get 

 and 

, so we can parameterize the intersection by

where 

.
Image attached.
 
        
        
        
Answer:
Step-by-step explanation:
4.
a)
P = 2width + 2length 
8x = 2x + 2 length; 8x-2x = 2 length; 6x=2 length 
length = 3x
b) 
sides= 1/4 of 3x = 3x/4 
perimeter of square = 4* side = 4*3x/4 = 3x
c) 
x= 4
P rectangle =8x= 8*4= 32
P square = 3x = 3*4 = 12
32-12 = 20 cm greater is the P rectangle than P of square
d) 
A rectangle = 2x*x = 2*4*4 = 32
A square =(3x/4)² = (3*4/4)² = 9
32-9 = 23 cm² greater is the A rectangle than A of square
5. 
4Comic+1 Nonfiction
4comic = 8y so 1 comic = 2y
1 nonfiction = (3+7y)+ 2y
a)
1 nonfiction = 7y+2y+3 = 9y+3
b)
total= 8y+9y+3 = 17y+3 
if y=4
total = 17*4 +3  = $71
 
        
                    
             
        
        
        
2? bc if x=7 then it equals 2(7) which is 14 sooo i believe either 7 or 2
        
                    
             
        
        
        
Answer:
oh this is the topic we are talking on in my class
 
        
                    
             
        
        
        
Answer:  A. There were 500 liters in the tank when the leak started, and it is  decreasing by 9 liters per minute.
Step-by-step explanation:
This equation is in the form; y =mx + c. 
<em>c</em> in this equation is the value of y when x is at 0. 
<em>c</em> in the above formula is 500 which means that the number of litres (y) at zero minutes(x) is 500 litres. 
<em>m</em> is the rate of change as a result of a change in x. 
<em>m</em> in this equation is -9 which means that the water is reducing by 9 litres every minute (x).