Answer:
x=9
Step-by-step explanation:
- -54 + 6x = 6 • (x - 9)
- Solve : 6 = 0
- Solve : x-9 = 0
- Add 9 to both sides of the equation : x = 9
t(f) = 27*f
g(t) = $0.04*27*f
without the value for f (the number of friends) that is the farthest this can be solved.
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