Sum means add
the number is x
13 divided by a number is 13/x
the number divided by the number is x/13
so

also can be simplified to

or

translated it is

where x is the number
The answer is 47 because 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47
X y
-2 -3
-1 -1
0 1
1 3
2 5
i can’t graph it, but i hope this helps
As function is = 4x
so
4x=-x+5
5x=5
x=1
$125 because when you do $500x0.75 it equals $375. $500-375=$125