Question

11) If the first two terms of an. A
P are -3 and 4 , then what is the twenty first term ?*​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

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Step-by-step explanation:

a1=-3

a2=4

d=a2-a1=4-(-3)=4+3=7

therefore,

a3=a2+d=4+7=11

a4=a3+d=11+7=18

a5=a4+d=18+7=25

a6=a5+d=25+7=32

a7=a6+d=32+7=39

a8=a7+d=39+7=46

a9=a8+d=46+7=53

a10=a9+d=53+7=60

a11=a10+d=60+7=67

a12=a11+d=67+7=74

a13=a12+d=74+7=81

a14=a13+d=81+7=88

a15=a13+d=88+7=95

a16=a15+d=95+7=102

a17=a16+d=102+7=109

a18=a17+d=109+7=116

a19=a18+d=116+7=123

a20=a19+d=123+7=130

a21=a20+d=130+7=137