Using Addition, the total earnings were 15t+4.
What is Addition?
The addition is "taking two or more numbers and adding them together".
According to the question,
Earning on Monday = 7t - 1
Earning on Tuesday = 8t + 5
To get total earnings only by adding two earnings
(7t - 1) + (8t + 5) = 15t +4
Hence, total earnings were 15t+4,
To learn more about Addition here
https://brainly.com/question/16505812
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