Evaluate:

70 Σ(2n-1) n=4

To evaluate this expression, we substitute n=4 into the given expression:

70 Σ(2(4)-1)
= 70 Σ(8-1)
= 70 Σ(7)

Now, we have to evaluate the summation of 7 for n=4:

= 70 * 7
= 490

Therefore, the result of evaluating the expression 70 Σ(2n-1) for n=4 is 490.