Answer:
7x-1
Step-by-step explanation:
6+8x-7-x
Combine like terms
8x-x +6-7
7x-1
C. You can graph it on Desmos and all the given points work.
An example of the ratio 4:1 could be, in a school for every 4 girls there is 1 boy. Or something similar:)
An=A1+(n-1)d
-20=A1+(15-1)x-7
-20=A1+14 x -7
-20=A1-98
+98 +98
-98+98=0
-20+98=78
A1=78
