12.5 refills
See work in attached picture
So you do 93 times 60 because it said you have to do 6 ten times and that equal 5580
The linear equation is y = 4 + 0.5x
<h3>How to determine the equation?</h3>
The points are given as: (-2,3) and (4,6)
The equation is then calculated using:

Substitute the known values

Evaluate
y = 0.5 *(x+2) + 3
Expand
y = 0.5x + 1 + 3
Evaluate the sum
y = 0.5x + 4
Rewrite as:
y = 4 + 0.5x
Hence, the equation is y = 4 + 0.5x
Read more about linear equations at:
brainly.com/question/14323743
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Answer:
3.
B) 50
4.
A) 2.3 hours