fafu123 fafu123

12-10-2017
Mathematics

contestada

find the sum of all 3 digit whole numbers that arw divisible by 13 ?

Respuesta :

zrh2sfo zrh2sfo

12-10-2017

We have an arithmetic sequence with

a0 = 1st 3-digit number divisible by 13
a0 = 104
d = 13 (why?)
last term is largest divisible by 13 = 988
how many terms? (988-104)/13 + 1 = 69

S = 69/2(104+988) = 37674

Answer Link

Otras preguntas

Factor the following and find the zeros.1. x2 - 169 = 0 2. x2 + 14X + 49 = 03. x2 - 17x + 42 = 0 4. 2X2 - 9X - 5 = 05. 3X2 + 11X - 4 =0

Need help please-3x + 5x -2 > 8x - 7 -9x

During an experiment, which factors are observed and measured ?????

write quadratic equation whose roots are 4 and -3 and whose leading coefficient is 5 use the letter X to represent the variable ? =0

a 22 foot ladder is placed against a vertical wall of a building with the bottom of the ladder standing on level ground 16 feet from the base of the building. h

I suck at math so I need help :(

what is a example of democracy?

I got 60 right out of 110 questions on a test. What was my overall grade/percentage?

how do i say have a nice day in Spanish

what is scapegoating?