313
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No
Add them up: 5 + 300 + 8 = 513 I suspect that you may have a zero missing: either: 50 + 300 + 8 = 358 or: 5 + 300 + 80 = 385 Expanded form is usually written with the biggest number first and the rest in decreasing value, ie 358 = 300 + 50 + 8 385 = 300 + 80 + 5
65.09
As a polynomial in standard form, x plus 5x plus 2 is 6x + 2.
200 + 50 + 5 = 255