Question

Find the sum of -29,-24,-19,-14......+91

Answer 1

a = -29

d = -24-(-29) = 5

Tn = 91

a+(n-1)d = Tn

-29+(n-1)5=91

-29+5n-5=91

-24+5n=91

5n=91+24

5n=115

n=23

therefore,n=23

Tn=a+(n-1)d

T23=-29+(23-1)5

T23=-29+22×5

T23=-29+110

T23=81

Therefore,

the sum of -29,-24,-19,-14......+91 is equal to 81.

Answer 2

Step-by-step explanation:

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