Question

Find the sum 4+12+20+...........+100.
step by step ​

Answer 1

Answer:

I hope you got the answer......... THANKS

Answer 2

Answer:

676

Step-by-step explanation:

a = 4, d = 8, an = 100, n and Sn = ??

an = a + (n-1) d

100 = 4 + (n-1)8

100 = 4 + 8n - 8

8n = 104

n = 13

S13 = (n/2)(2a + (n-1)d)

S13 = 6.5 * (2(4) + (12)8)

S13 = 6.5 * 104

S13 = 676

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