# For a certain function f = f(x), we know that f is proportional to x and that the constant of proportionality is 20. Find a formula for f. a) f(x) = 20x b) f(x) = 20 c) f(x) = x+20 f(x) = 20 x^20

###### Question:

For a certain function f = f(x), we know that f is proportional to x and that the constant of proportionality is 20. Find a formula for f.
a) f(x) = 20x
b) f(x) = 20
c) f(x) = x+20
f(x) = 20 x^20

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