Answer:

Step-by-step explanation:
We were given the slope formula;

This line is vertical if the denominator is zero.
That is when 
This implies that;

Justification;
When
, then, the line passes through;
and 
The slope now become

The equation of the line is

This implies that;




... This is the equation of a vertical line.
Answer:
$9.00
Step-by-step explanation:
If the price is at 30% discount, this means it is 100-30 = 70% of the original price.

Hence, original price is $9.00.
Answer:
Find the product as follows 9/10 x 2/5= 18/50
Step-by-step explanation:
I had this question and got it right!
Answer:
B, using a sample of size 200
Step-by-step explanation:
just got it right