ANSWER
C)

EXPLANATION
A linear function is a function whose graph is a straight line.
The graph of y=x is a straight line.
The graph of y=3x -7 is also a straight line.
The graph of y=x² is a parabola.
This graph is not a straight line .
It is a non-linear function.
y=3 and y=13 are also straight lines.
The correct choice is C.
Answer:
cost of 1 kg of washing powder is $1.2
Step-by-step explanation:
9 kg = $10.80
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cost for 1 kg =
The Pythagorean theorem tells you the other leg is
... √(c² - a²) = √(4.2² -2.9²) = √9.23 ≈ 3.038 ≈ 3.0
_____
There is insufficient information to do anything with forces.
Solution:
12 hours = 12 * 60 minutes = 720 minutes
Number of days lose = 
So, 17th May + 120 days = 14th Sep.