You can complete one-tenth of a task in an hour. Your friend can complete two-fifths if the same task in an hour. How long will it take to complete the task if you work together?

Eileen purchased 3.4 pounds of apples at the total cost of $19.72. if she purchases 6.2 pounds of apples at this store, how much would it cost?

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?