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

Calculate the percentage of the total number of fynbos species that are bulbous herbs. Show all your working.

Identify the importance of school for students and teachers in Japan

how are the atoms of different elements different?

Parallel lines, Transversals, Algebra Worksheet. I really need help with these problems

6. What views of motherhood and childhood are explored in the story “A short story for Children by Svava”? /2

What is the assembly language equivalent of each of the following binary languages instructions? 010100110000101 and 001100000000101

While behind the wheel, Emil suffers an epileptic seizure and passes out. The car careens onto the sidewalk and strikes a group of schoolgirls, badly injuring f

A car enters the freeway with a speed of 7.1 m/s and accelerate on uniformly for 3.3 km in 3.1 minute how fast is the car moving after this time

2] 2 Study Figure 2, a photograph of a coastal area. Use evidence from Figure 2 to suggest how this coastal area may change in the future. Explain your answer.

3x /4x-1/-2=19 cho trong ko ghi