1 Workers A, B, and C can complete a job in a, b, and c hours, respectively. Working together, they can complete

of the job in 1 hour. Add these fractions over a common denominator to obtain an expression for what they can do in 1 hour, working together?
2. Suppose that a company's daily sales volume attributed to an advertising campaign is given by

where t is the number of days since the campaign started. Express the sales volume as a single fraction?

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1.1 1 3 Sales volume =1+ 18 t+3 (t+ 3)