True or false, when n is an negative integer, n-n=0

One angle of a right triangle measures 55°. What is the measure of the other acute angle?

Tom had $84.50 and then spent $12.25 for a music CD, $17.85 for a gift, and CV$15.45 for gasoline. How much did he have left?

Suppose the coffee industry claimed that the average adult drinks 1.7 cups of coffee per day. To test this claim, a random sample of 40 adults was selected, and their average coffee consumption was found to be 1.9 cups per day.

Luther won 12 of the last 20 video games he played. Suppose Luther plays a total of 60 games with his friends over the next month. Predict how many of these games Luther will win.

The product of two consecutive even integers that are negative is 224. Write an equation and find the two integers.

a shopkeeper bought two watches for rs 400. he sold them to gain 5% profit on one and another at 5% loss on other. calculate his final loss or profit percent. if the sp of both watches are same

The sum of twice a number and 5 is at most 15. what are the possible values for the number

You go to a restaurant and your bill is $8.00. If you leave a 15% tip, How much did u spend all together at the restaurant?

What is the explicit formula for the sequence 7,2,-3,-8,-13

What is the degree of 7x^6?