Help Solve Math Homework Qs -3, -1, 1 & CD 2

In summary, the conversation discusses a math homework question with the numbers -3, -1, 1, and CD 2. These numbers are referred to as "terms" and will be used to find the solution. The first step in solving the question is to identify the pattern or rule, which is subtracting 2 from the previous number. "CD 2" represents an unknown value that needs to be solved using the given pattern. To solve the question, one must use the given numbers and pattern to find the missing value, which will be the solution. An example is provided, where the solution for "CD 2" is determined to be -1.
  • #1
Skaterkid
1
0

Homework Statement




http://puu.sh/ajGv [Broken]


Homework Equations



??


The Attempt at a Solution



Q1- is -3, -1 and 1
Q2- CD is 2
Q3- I don't understand hence can't even start it
 
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  • #2
That expression just means what is the sum of 2r-5 from r=1 up to n. So, what is

(2(1)-5)+(2(2)-5)+(2(3)-5)+...+(2(n)-5)

You should have been given a formula to calculate the sum of an arithmetic series.
 
  • #3
use the following:


arithmetic%20sum%20formula1.gif
 
  • #4
Did you reach your answer yet?
 

1. What do the numbers -3, -1, 1, and CD 2 represent in this math homework?

-3, -1, 1, and CD 2 are the numbers that need to be solved in this math homework question. They are known as the "terms" of the equation and will be used to find the solution.

2. What is the first step in solving this math homework question?

The first step in solving this math homework question is to identify the pattern or rule. In this case, the numbers are decreasing by 2 each time, so the rule is to subtract 2 from the previous number to get the next number.

3. Can you explain the concept of "CD 2" in this math homework question?

"CD 2" is a term used in place of a number in this equation. It represents an unknown value that needs to be solved. To find the value of "CD 2", you will need to use the given pattern or rule to determine what number should be placed in its place.

4. How do I solve this math homework question using the given numbers?

To solve this math homework question, you will need to use the given numbers and the identified pattern or rule to find the missing value. In this case, you will need to subtract 2 from the previous number each time until you reach the missing value, which will be the solution.

5. Can you provide an example of how to solve this math homework question?

Sure, let's say the missing value is "CD 2" and the given numbers are -3, -1, and 1. Using the identified pattern of subtracting 2 from the previous number, we can solve for "CD 2" as follows:
1st term: -3
2nd term: -1 (subtract 2 from -3)
3rd term: 1 (subtract 2 from -1)
4th term: CD 2 (subtract 2 from 1)
Therefore, the solution for "CD 2" is -1.

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