Answer:

Step-by-step explanation:
and
does not have any common factor except for 
10 (13) 15
35 (37) 40
45 (48) 50
60 (61) 65
90 (93) 95
9514 1404 393
Answer:
x = -(9/7)n -81
Step-by-step explanation:
Subtract the n term.
x/-9 = 9 -n/-7
Multiply by -9.
x = -81 -(9/7)n
It is a percentage because it can be written as a fraction
676 - 178 is 498.
498/2 is 249.
There were 249 bike riders and (249 + 178) hikers.