Ametallurgist has an alloy with 15% titanium and an alloy with 30% titanium. he needs 100 grams of an alloy with 21% titanium. how much of each alloy should be mixed to attain the 100 grams of alloy with 21% titanium?

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

Is the square root of 4 plus the square root of 16 rational?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?