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arithmetic

Step-by-step explanation:

an arithmetic sequence is a sequence that moves up or down at a constant rate and the constant is 3

A. arithmetic

Step-by-step explanation:

We are given the sequence 3, 6, 9, 12 and are asked to determine whether it is arithmetic, geometric, or neither.

Let's define the two different terms :

Arithmetic - Sequence where a certain number gets added or subtracted

Geometric - Sequence where a certain number gets multiplied or divided.

3, 6, 9, 12

If we try geometric, which would be explained with 3 * 2 to get 6, but then multiplying 6 * 2 gets you 12. Not 9. Therefore it is not geometric.

Try arithmetic, 3 + what = 6. 3. 3 + 3 = 6. 6 + 3 = 9. 9 + 3 = 12.

Arithmetic works, therefore arithmetic is the sequence.

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

hope this