Mathematics, 12.08.2020 06:01 lailai432
Use sigma notation to represent the sum of the first seven terms of the following sequence -4,-6,-8
Answers: 3
![S_n = \frac{n}{2}[2a+(n-1)d]](/tpl/images/0719/2644/cdb23.png)
![S_7 = \frac{7}{2}[2(-4)+(7-1)(-2)]\\\\S_7 = \frac{7}{2}[-8+(6)(-2)]\\\\S_7 = \frac{7}{2}[-8-12]\\\\\\S_7 = \frac{7}{2} * -20\\\\S_7 = -70](/tpl/images/0719/2644/f1daf.png)
![S_n = \frac{n}{2}[2(-4)+(n-1)(-2)]\\\\S_n = \frac{n}{2}[-8+(-2n+2)]\\\\S_n = \frac{n}{2}[-6-2n]\\\\S_n = \frac{-6n}{2} - \frac{2n^2}{2}\\S_n = -3n-n^2\\\\S_n = -n(3+n)](/tpl/images/0719/2644/25a60.png)
Another question on Mathematics
Mathematics, 21.06.2019 20:00
Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !
Answers: 1
Mathematics, 21.06.2019 20:00
Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line
Answers: 1
Mathematics, 21.06.2019 22:30
I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.
Answers: 3
Mathematics, 22.06.2019 00:30
Tyler reads 2/5 of a book on monday, 1/3 of it on tuesday, 2/9 of it on wednesday, and 3/4 of the remainder on thursday. if he still has 14 pages left to read on friday, how many pages are there in the book?
Answers: 3
You know the right answer?
Use sigma notation to represent the sum of the first seven terms of the following sequence -4,-6,-8...
Questions
History, 28.08.2020 05:01
SAT, 28.08.2020 05:01
Mathematics, 28.08.2020 05:01
English, 28.08.2020 05:01
History, 28.08.2020 05:01
English, 28.08.2020 05:01
Mathematics, 28.08.2020 05:01
