Answer:
1/2
Step-by-step explanation:
y=1/2x
1/2 is constant
Answer:

Step-by-step explanation:
Given
Represent number of DVDs with x


(at most)
Required
Represent as an inequality
If 
x DVD would cost:


So, to make an order of x DVDs, Deacon will pay for
x DVDs and Handling Fee
So:

Recall that his budget is at most $75
This implies that: 
So, the relationship between his payment and budget is:

Answer:
D= 37
C= 53
x+x-16=90
+16 +16
2x=106
/2 /2
x=53
Answer:
If the pool is 2/3 filled and then the inlet pipe and drain pipe are opened, it will take 140 hours to fill the pool
Step-by-step explanation:
An inlet pipe can fill the pool in hours = 20
Inlet pipe 1 hour work = 
A drain pipe can empty the pool in 21 hours
Drain pipe 1 hour work =
Inlet pipe and drain pipe 1 hour together work = 
Now we are given that the pool is 2/3 filled
So, remaining portion to be filled =
So, Inlet pipe and drain pipe fill
in hours = 1
So, they can fill 1/3 in hours = 
Hence If the pool is 2/3 filled and then the inlet pipe and drain pipe are opened, it will take 140 hours to fill the pool