Question

in an ap common difference=(-3) and n=7 find a

Answer 1

Answer:25

Step-by-step explanation:n is 7,d is -3

Therefore by the formula;

n=a+(n-1) d

7=a+(7-1) (-3)

7=a+(6*-3)

7=a-18

Therefore, a=25

Hope it's helpful:)

Answer 2

Answer:

Step-by-step explanation:

an=a+(n-1)d

7=a+6(-3)

a=18-7

a=11