Changing value using code of a specific row/column in a csv file

I am using R studio and have been using read.csv, read.table, and my data to answer homework questions on manipulating data from a csv file. I have a specific row and column that I want to change from one number to another in the csv file. I don't know what to use and can't figure out from the books I have or google.

Can someone help me with the code?


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