Answer:
C. 48
Step-by-step explanation:
first you solve 84 divided by 7 and your answer is 12 then you do 12x4 which is 48
We have a sequence that meets the given criteria, and with that information, we want to get the sum of all the terms in the sequence.
We will see that the sum tends to infinity.
So we have 5 terms;
A, B, C, D, E.
We know that the sum of each term and its neighboring terms is 15 or 25.
then:
- A + B + C = 15 or 25
- B + C + D = 15 or 25
- C + D + E = 15 or 25
Now, we want to find the sum of all the terms in the sequence (not only the 5 given).
Then let's assume we write the sum of infinite terms as:

Now we group that sum in pairs of 3 consecutive terms, so we get:

So we will have a sum of infinite of these, and each one of these is equal to 15 or 25 (both positive numbers). So when we sum that infinite times (even if we always have the smaller number, 15) the sum will tend to be infinite.
Then we have:

If you want to learn more, you can read:
brainly.com/question/21885715
No you do not. I think I will help.
The answer is 100 percent B
Answer:
21 is answer
Step-by-step explanation:
Find the value of expression the a3−3a2+5a−7 by substituting a=3.