Answer: Not too sure. Sorry.
Step-by-step explanation:
A1 = first term
a1 = 15
---------------------------------------------
d = common difference
d = (second term) - (first term)
d = a2 - a1
d = 9-12
d = -3
The negative common difference indicates that the terms are decreasing
Each time we subtract 3, or add -3, to get the next term.
----------------------------------------------
nth term of arithmetic sequence
an = a1 + d(n-1)
an = 15 + (-3)(n-1)
an = 15- 3n + 3
an = 18 - 3n
Answer is choice D
drSSSNSNSNSNSNSNSNSNSNSNSNSNSNSN
Answer:
The width of the carpet is 12 inches and the length of the carpet is 120 inches.
Step-by-step explanation:

^We can distribute first^
Distributing would result in:

Then we would combine like terms, which would result in:

Then we solve the equation.

Since the width of the carpet is 12 (as we figured out). The statement said that "The length of the carpet is 108 inches more than the width."
So now we add 108 to 12 to figure out the length.

The length of the carpet is 120 inches.
Answer:
Sum: 8w-8
Value of w: w= 1
Step-by-step explanation: