Just as you have to line up the decimal places with numbers, you can only add like powers with polynomials.
So, add up all the terms with x^4: (0.15 + 1.25 - 0.35) = 1.05
Add up all the x^3 terms: (0.10 -0.01 + 0.27) = 0.36 (assuming 027x^3 should be 0.27)
Add up the x^2 terms: (0.01 + 0.11 + 0.15) = 0.27 (assuming 15x^2 should be .15)
Add up all the x terms: (1) = 1
Add up the plain numbers: (0.01 + 0.99 - 0.03) = 0.97
Put it all together to get
1.05x^4 + 0.36x^3 + 0.15x^2 + x + 0.97
If my assumptions about decimal places are wrong, adjust things as needed.
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