Sure thing, honey. To write 128 in expanded notation using exponents, you'd express it as 1 x 10^2 + 2 x 10^1 + 8 x 10^0. So, it would be 1 x 100 + 2 x 10 + 8 x 1. Easy peasy lemon squeezy.
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640 written in expanded form using exponents is (6 x 10^2) + (4 x 10^1) + (0 x 10^0)
7049 = 7*19*53
91.4 = (9 x 101) + (1 x 100) . (4/101)
Expanded Notation of 91,400,000 = (9 x 107) + (1 x 106) + (4 x 105) + (0 x 104) + (0 x 103) + (0 x 102) + (0 x 101) + (0 x 100)
9,000,000 in expanded form using exponents is (9 x 106) + (0 x 105) + (0 x 104) + (0 x 103) + (0 x 102) + (0 x 101) + (0 x 100)