Answer:
Option (c) is correct.
Total after m months , his typing speed will be (180+5m) words per minute.
Explanation:
Given: Donald can currently type 180 words per minute, and
believes that with practice he can increase his typing speed by 5 words per minute each month.
We have to express the given statement mathematically and choose the correct answer from the given options.
Since, Donald is able to type 180 words per minute currently.
And given his typing speed increases 5 words per minute each month.
If he typed for m months he can write 5m words.
So, Total after m months , his typing speed will be (180+5m) words per minute.