Verified answer

Answer:

The sum of the first 5 terms of the sequence 4, 20, 100, ... is 3124.

Step by Step explanation:

To find the sum of a geometric sequence with a common ratio of 5 and an initial term of 4, we can use the formula Sn = a1 * (1 - rn) / (1 - r).

For example, let's find the sum of the first 5 terms:

S5 = 4 * (1 - 5^5) / (1 - 5)

= 4 * (1 - 3125) / (1 - 5)

= 4 * (-3124) / (-4)

= 3124