Math, asked by ssamit368, 7 months ago

please give me the answer

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Answers

Answered by mrblueout

1

Answer:

Step-by-step explanation:

ok i will give you the nswer

wait 51 minutes

Answered by snipersudar

1

Answer:

t20=42

Step-by-step explanation:

Sn=n^2+3n

s1=1+3=4=a

s2=4+6=10=2a+d

2a+d=10

8+d=10

d=2

tn=a+(n-1)d

t20=4+(19)2

t20=42

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