tawfiqahmed2006 tawfiqahmed2006

23-04-2020
Mathematics

contestada

Find the sum of the following numbers without actually adding them1+3+5+7+9+11+13+15

Respuesta :

LammettHash LammettHash

23-04-2020

S = 1 + 3 + 5 + ... + 11 + 13 + 15

S = 15 + 13 + 11 + ... + 5 + 3 + 1

==> 2S = (1 + 15) + (3 + 13) + (5 + 11) + ... + (15 + 1)

There are 8 terms in the sum, so

2S = 8 * 16 = 128

S = 128/2 = 64

Answer Link

Otras preguntas

Which sentence from the text best develops the theme about the importance of compassion for other people?

What genre is the book 'black beauty' by Anna Sewell

Using the verb in parentheses, write the correct command for the subject given. 1. Ustedes (subir)____________ 2. Usted (ver)_____________ 3. Ustedes (pagar)___

If the original statement is in the form "If a, then b," then the contrapositive is in the form "______" answer choices attached

What was the goal of realist writers and artists? A. to present reality and comment on social wrongs B. to give the lower class hope and strength C. to provide

how to anwser a quetion

Please help me with this question.

Your teacher was given an apple by a student trying to get on her good side. It sits on her desk the whole year, not moving. You know that, if the apple were to

Francesca bought 27 key chains of two different kinds to make goody bags for her birthday party. Supergirl key chains were $3 and Wonder Woman key chains were $

Don't Laugh For Giving High Points..I'm New To Here......I Want Know The Abstract Noun Of 'Proud'What Is That