Answer:
<em>The function to represent this relationship will be: 
</em>
Step-by-step explanation:
varies inversely with 
. That means......
where 
is a proportional constant.
Given that, when 
, then 
Plugging these values into the above equation, we will get.....
Now plugging this 
into equation (1).....
So, the function to represent this relationship will be:
<span>A) 2x - 7y = 13
B) 3x + y = 8
Multiplying equation B by 7
B) 21x + 7y = 56 then adding it to A
</span><span>A) 2x - 7y = 13
23x = 69
x = 3
y = -1
</span>
<h3>Answer: 71</h3>
==================================
Explanation:
Multiply the values in the second and third columns. Do this row by row.
Row1: 50*55 = 2750
Row2: 75*32 = 2400
Row3: 150*13 = 1950
Add up the products to get 2750+2400+1950 = 7100
Then divide this by the total frequency 55+32+13 = 100 to get 7100/100 = 71
