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the cost of barbara’s dinner is $15.90 including tax. she leaves a tip that is 18% of the total cost of the dinner. what is the best estimate for the amount of the tip?

How do i do this activity, is appreciated

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?