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M is a drug recently proven to be effective in treating male pattern baldness. The pharmicist mixes a solution 2%M. He has 50 ml of a 1% solution. He adds 4% solution to it to obtain the desired 2% solution. How much 4% solution does he add?

A pizza with cheese and tomato topings cost $8.00. There is a cost of $1 for each extra topping. Write an algebraic expression for the cost of a pizza with extra toppings.

A traffic check counted 390 cars passing a certain spot on one day and 430 cars at the same spot on the second day. The first day there were 3 times as many cars going east and half as many cars going west on the second day. What was the total number of eastbound cars...