Question

Find nthterm of – 15 , -18 , -21 ,

Answer 1

Answer:

$t(n) = t + (n - 1)d$

$d = - 18 - ( - 15)$

$d = - 18 + 15$

$d = - 3$

$t = - 15$

$t(n) = - 15 + (n - 1)( - 3)$

$t(n) = - 15 - 3n + 3$

$t(n) = - 12 - 3n$

$t(n) = - 3(4 + n)$

Answer 2

Answer:

t(n)=t+(n−1)d

d = - 18 - ( - 15)d=−18−(−15)

d = - 18 + 15d=−18+15

d = - 3d=−3

t = - 15t=−15

t(n) = - 15 + (n - 1)( - 3)t(n)=−15+(n−1)(−3)

t(n) = - 15 - 3n + 3t(n)=−15−3n+3

t(n) = - 12 - 3nt(n)=−12−3n

t(n) = - 3(4 + n)t(n)=−3(4+n)

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