Pump A can fill a tank in 8 hours. Pump B can fill the tank in 6 hours. How long will it

take to fill the tank using both pumps? Round answers to the nearest tenth if

necessary.

Evaluate the expression. (9 + 5)(3 + 2)0

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.

How can you check that you have correctly converted frequencies to relative frequencies?