Answer:

Step-by-step explanation:
we know that
The equation of a circle in standard form is equal to

In this problem we have


substitute


The intersection of two planes is a line. That's not necessarily the definition of a line, but that's probably what they're looking for.
Answer: line
After 7 hours the studios will cost the same
60*.2= 12
$12 is off of the original price
now add to find original price
60+12= 72
So the regular price of the sweater is $72<span />