Question

The question is from arithmetic progression

Answer 1

HEYA MATE, HERE IS UR ANSWER


1. a=7
d=3
n=8
an=a+(n-1)d
an=7+(8-1)3
an=7+7×3
an=7+21
an=28


2.a=-18
n=10
an=0
a+(n -1)d=0
-18+(10-1)d=0
-18+9d=0
9d=0+18
d=$\frac{18}{9}$
d=2

3.d=-3
n=18
an=-5
a+(n-1)d=-5
a+(18-1)(-3)=-5
a+17×-3=-5
a-51=-5
a=-5+51
a=46


4.a=-18.9
d=2.5
an=3.6
a+(n-1)d=3.6
-18.9+(n-1)2.5=3.6
(n-1)2.5=3.6+18.9
(n-1)2.5=22.5
(n-1)=$\frac {22.5}{2.5}$
n-1=9
n=9+1
n=10

5.a=3.5
d=0
n=105
an=a+(n-1)d
an=3.5 +(105-1)(0)
an=3.5+104×0
an=3.5+0
an=3.5


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