Why is the sum of a rational number and its opposite always equal to 0

What is the intersection of the sets A={2,3,5,7,11} and B={5,11,13,15,17}

A 9-foot piece of wood is cut into 5 equal sections. Which equation shows how to find the number of feet in each section?

Danika has saved enough money to pay cash for a used car. She wants to buy a car that costs four thousand nine hundred dollars before taxes.

Let X represent the time it takes from when someone enters the line for a roller coaster until they exit on the other side. Consider the probability model defined by the cumulative distribution function given below. 0 x < 3 F (x) = (x-3) / 1.

What is 1-1/2 times 55

The original price of a motorcycle was reduced by $275. The new discounted price is $1329.

What is the capacity of the cube in liters 9 cm

Which is the best estimate of the difference between 6 7/8 and 2 1/8

Ally saved 60 percent of the cost for a cell phone. If she saved $105, what is the cost of the phone?

What is the value of the underlined digit? 45,769,331. The 6 is underlined.