21*9=9*21 what property is used

Two groups collect litter along the side of a road. It takes each group 5 minutes to clean up a 200-yard section. How long does it take to clean up 2 miles? Explain how you solved the problem.

What is the solution to the equation 5 + 10x = 50? x = 1.5 x = 4.5 x = 5.5 x = 6.5

If the temperature in Minneapolis was - 20℉ and then dropped to - 25℉, what was the change in temperature?

Describe the two possible ways to use the angle of depression that is outside a right triangle to find the measure of an angle inside the triangle?

The length of a rectangle is twelve inches more than its width. The perimeter of the rectangle is 276 inches. What are the dimensions of the rectangle?

A researcher conducts a hypothesis test on a population proportion. Her null and alternative hypothesis are H0 : p = 0.4 and Ha : p < 0.4. The test statistic and p-value for the test are z = - 3.01 and p-value = 0.0013.

How do I solve (-2-6i) (1 + i)

I'm a election 4713 people voted candidate B received 2 thirds of the votes. How many votes did candidate b receive

A car can travel 476 miles on 14 gallons of gas. Write an equation relating to the distance d to the number of gallons g. How many gallons of gas first this car need to travel 578 miles?

What is the volume of a cereal box that is 2 inches thick, 12 inches high and 10 inches wide? A) 24 cubic inches B) 72 cubic inches C) 120 cubic inches D) 240 cubic inches