Which of the following is an arithmetic sequence?

Step-by-step explanation:

The given above is an arithmetic sequence with first term equal to 3 and the common difference equal to 4. That is from 7 - 3 = 11 - 7 = 15 - 11. The nth term of an arithmetic sequence is given by the equation,

                                       an = a1 + (n - 1) x d

Substituting the given,

                                       an = 3 + 4(n - 1)

thus, the answer is the fourth choice. 

Step-by-step explanation:

Option A:

Common difference is not same, not an arithmetic sequence.

Option B:

Common difference is not same, not an arithmetic sequence.

Option C:

Common difference is same, an arithmetic sequence.

Option D:

Common difference is not same, not an arithmetic sequence.

Option C is the correct answer.

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13