Question

. How many les UI WI Ol.),
The first term of an A P is 5, the last term is 45 and the sum is 400. Find the number of term
and the common difference.​

Answer 1

Answer:

Step-by-step explanation:

I hope this is useful for you

Answer 2

Step-by-step explanation:

a=5

an=45

Sn=400

d=?

n=?

using the formula

Sn=n/2(a+an)

400×2=n(5+45)

800=n(50)

800/50=n

n=16

an=a+(n-1)d

45=5+15×d

5÷{40/15=d

8/3=d