Sandra is 20 years older than her son. In 5 years, Sandra’s age will be 3 times her son’s age. How old is Sandra’s son?

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.