I might be wrong but I think it is 50 .
Yes, the number of words ARE proportional to the number of minutes she types, away to tell is when it says Bella types at a CONSTANT rate of 42 words per minute. This means for every minute 42 words will be added.
Increasing function value shifts the line up.
answer: 2. up
11%
I multiplied the price by percentages up until I got a little over 2.