Tuesday

January 27, 2015

January 27, 2015

Posted by **Kathleen** on Wednesday, May 26, 2010 at 4:07pm.

The pattern is -5,10,-15,20,-25. What is the rule? A sub n = ?

- Algebra -
**Reiny**, Wednesday, May 26, 2010 at 4:29pmterm

_{n}= (5n)(-1)^n

- Algebra -
**Lee**, Wednesday, May 26, 2010 at 4:35pmThe signs are alternating and each term is

a multiple of 5. The rule would be

(-1)^n(5*n) where n are the integers

1 through 5. To show you that this is true I will evaluate the expression for

each value of n 1 through 5

n=1 (-1)^1*5*1=-1(5)=-5

n=2 (-1)^2*5*2=1(10)=10

n=3 (-1)^3*5*3=-1(15)=-15

n=4 (-1)^4*5*4=1(20)=20

n=5 (-1)^5*5*5=-1(25)=-25

**Answer this Question**

**Related Questions**

Math - Help, I can't find the pattern rule for this sequence(eg. -6,-3,2,9,18 ...

Pre-Algebra - Write a rule for this pattern.Fing the next three numbers in the ...

Math: Pattern - Use the rule to write the first 12 terms in the pattern. Rule: ...

math - i can not find the pattern or a rule... write the next three terms and ...

english - Which pattern is most effective to deliver a persuasive message when ...

pattern help please?? - write the next three terms and write a rule to describe ...

math - Kurt used the rule add 4, subtract 1 to generate a pattern. The first ...

Math Grade 5 - A number pattern with the rule 6n, where n represents the ...

math - One number in each group does not fit 66,90,32,45,300 Pattern? 99,981,459...

math - I have finished all my homework but I have one problem that I cannot ...