Question

A progression has a first term of 12 and a fifth term of 18.

Find the sum of the first 25 terms in the progression is aritmetic.

Answer 1

If th progression is an AP!
Then a = 12 and a+4d = 18
So d = 6/4 = 3/2 = 1.5
So sum can be found by
S = n/2(2a+(n-1)d)
You have
a = 12
d=1.5
n = 25
Just put it in the equation and then SOLVE!! :)
Getting me? :)

Answer 2

ummm im ok :) it'll take me a bit to understand could i get back to you ?

Answer 3

Perfect ! i get it ! thanx a lot

Answer 4

:)

Answer 5

A progression has a first term of 12 and a fifth term of 18.

Find the sum of the first 25 terms in the progression is aritmetic.

Answer 6

The 1st term of an arithmetic progression is a and the common difference is d, where d does not equal 0.

Answer 7

In a geometric progression, the second term has 9 less than the first term. The sum of the second and third terms is 30.

Answer 8

Different numbers x,y and z are the first three terms of geometric progression with common ratio r, and also the first, second and fourth terms of an arith

Answer 9

The sum of the first three terms of the AP is 30 and the sum of the squares of the first term and the second term of the same progression is 116.

Answer 10

I don't know why I am getting the wrong answer, please help!
16. The first term of an arithmetic progression is 6 and the fifth term is 12.

Answer 11

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Answer 12

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The sum of all the terms in this progression is 444.

Answer 13

An infinite geometric progression is such that the sum of all the terms after the nth is equal to twice the nth term.

Answer 14

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Answer 15

\"World's Hardest Easy Geometry Problem\" [for fun]

Answer 16

What moment contains the climax of \"To Build a Fire\"?\n\nA.\nThe man's partners find his body on the trail.

Answer 17

What moment contains the climax of \"To Build a Fire\"?\n\nA.\nThe man's partners find his body on the trail.

Answer 18

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Answer 19

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Answer 20

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Answer 21

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Answer 22

Which ordered pairs make both inequalities true? Check all that apply.\n(\u20132,

Answer 23

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