Evaluate:

70 Σ(2n-1) n=4

To evaluate the given expression, we first substitute the values of n from 4 to 70 into the expression 2n-1 and then sum up the results.

Plugging in n=4:
2(4) - 1 = 8 - 1 = 7

Continuing this process for n=5, 6, 7, ..., 70 and summing up the results:

2(5) - 1 = 9
2(6) - 1 = 11
.
.
.
2(70) - 1 = 139

Now, summing up all these results:

(7 + 9 + 11 + ... + 139) = 4865

Therefore, the value of the expression 70 Σ(2n-1) n=4 is 4865.