Question

Find tn , if a=20 and d=3

Answer 1

Answer:

tn=a+(n-1)d

so

tn=20+(n-1)3

tn=20+3n-3

tn=3n+17

Step-by-step explanation:

Answer 2

Step-by-step explanation:

$a = 20 \\ d = 3 \\ \\ T_{n} = a + (n - 1)d \\ T_{n} = 20 + (n - 1)3 \\ T_{n} = 20 + 3n - 3 \\ T_{n} = \underline{ \underline{ 3n + 17}}$