Roberto completely covered a square wall in his bedroom using 84 square feet of wallpaper without any overlap. To the nearest foot, what is the side length of his bedroom wall?

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Which of the following is not a subset of {1,2,3}?