The cost of a telephone call is $0.75 + $0.25 times the number if minutes. write an algebraic expression that models the cost of a telephone call that lasts t minutes

The cost of $0.75 is fixed, so the total cost of the phone call can't be less than 0.75.

Then, we add the variable part, the one depending on the number of minutes. If every minutes costs $0.25, then minutes cost dollars.

So, if you add the fixed and variable prices, you have the function modelling the cost of a telephone call that lasts minutes:

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

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