For several years, graham has gathered data on students who own a computer and on their performance on a typing-speed test. he creates the linear model y = 3.8x + 17.4 where y represents the typing speed, in words per minute, of a student and x represents the number of years the student has owned a computer. according to graham’s model, what is the approximate speed of a student who has owned a computer for three years?
a)21 words/min
b)29 words/min
c)56 words/min
d)64 words/min