A function is a relationship with a quantity (number). For example, if you made a table, and had one side be 1 2 3 4 5 (X axis) and then the y axis (other side) be 5, 10, 15, 20, 25, the function (rule) would be y= x5. The vertical line test is used to see if a graph has a function or not, so if it creates a vertical line on a graph, it has a function.
A real life situation would be miles per hour, so, for the x axis (hours) it said 1, and for the y axis (miles) it would be 60, this means in a duration of 1 hour you went 60 miles. Well, lets say you went 2 hours driving, the miles would be 120. 
For 3 hours, it would be 180. The function here is y= x60!
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The function g(x) is g(x)= (3x)^2
<h3>
How to solve for g(x)?</h3>
The complete question is in the image
From the graph in the image, we have:
f(x) = x^2
The function f(x) is stretched by a factor of 3 to form g(x).
This means that:
g(x) = f(3x)
So, we have:
g(x)= (3x)^2
Hence, the function g(x) is g(x)= (3x)^2
Read more about function transformation at:
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Answer:
Option C will be the answer.
 
        
             
        
        
        
83 boxes are required to carry 800 books.
According to the question:
One Box can hold weight = 30 pounds
We know that ,  1 pound= 0.45 kg
hence, 30 pounds = 30 x 0.45 = 13.5kg  
hence,  one box can carry 13.5 kg of weight.
Now, 
Weight of 1 book = 1.4 kg 
So, Total Weight of 800 books= 1.4 x 800 kg 
And , No. of boxes required to carry 800 books = (1.4 x 800)/13.5 = 82.96
                                                                              or approximately 83 boxes
Hence, 83 boxes are required to carry 800 books.
Learn more about Unitary Method  at :
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Yes
Example: some multiples of 8 are 8,16,24,32,40 and these are multiples of 2