A nurse mixes 40 cc of a 70% saline solution with a 10% saline solution to produce a 20% saline solution. How much of the 10% solution should he use?
The amount of 10% saline solution needed is?

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

Plz hurry evaluate the expression a+b where a=8 and b=19

Here is my question! jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?