Jeremy can type 140 words in 4 minutes and 525 words in 15 minutes. let x= minutes spent typing and y= words typed. what is the rate of change of y with respect to x

You can divide 140 by 4 which is 35

so it would be 35 words per minute

and if you want to find out if it works with the 525 word in 15 mintues

you can do 35 ×15 = 525