If 20% of all manually filed returns contain errors, and 0.05% of all electronically filed returns contain errors, how much more likely is a manual filer to make an error than an electronic filer?

400 times more likely.

Step-by-step explanation:

Converting the percents to fractions

20%  = 20/100 = 0.2

0.05%  = 0.05/100 = 0.0005

So required likely hood  = 0.2 / 0.0005

= 400.

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step-by-step explanation:

i hope this : )

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value