Question

If a= -18.9, d= 2.5, an= 3.6 then find n..

PLEASE TELL ME A SUITABLE ANSWER....
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Answer 1

Answer:

10

Step-by-step explanation:

an=a1+(n-1)d

3.6=-18.9+(n-1)2.5

3.6+18.9=(n-1)2.5

22.5=(n-1)2.5

22.5÷2.5=n-1

9+1=n

10=n

Answer 2

Refer to the attachment didii aur do muh toh jawab saale ko