f(20)=11+.4a+.5a^2+.2a^3

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Solution for f(20)=11+.4a+.5a^2+.2a^3 equation: 


Simplifying
f(20) = 11 + 0.4a + 0.5a2 + 0.2a3

Reorder the terms for easier multiplication:
20f = 11 + 0.4a + 0.5a2 + 0.2a3

Solving
20f = 11 + 0.4a + 0.5a2 + 0.2a3

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by '20'.
f = 0.55 + 0.02a + 0.025a2 + 0.01a3

Simplifying
f = 0.55 + 0.02a + 0.025a2 + 0.01a3

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