What does counterexample mean

What is the remainder when 1408 is divided by 9

Suppose that a class contains 15 boys and 30 girls, and that 10 students are to be selected at random for a special assignment. Find the probability that exactly 3 boys will be selected

Captain Jack Sparrow needs to get on his roof to check a leak. He has a 13-foot ladder that he leans against the house. The bottom of the ladder is 5 feet from the house. His roof is 11 feet high from the ground.

A rectangular floor is 12 feet long and 11 feet wide a rug that is 9 feet long and 7 feet wide covers part of the floor how many square feet of the floor are not covered by the rub

The numbers - 12,0, and 7 are all elements of which of the following A. Whole numbers B. Irrational numbers C. Counting numbers D. Integers

How many different slope scenarios are there?

What is the greatest common factor of 20 and 32?

How many 0.6 L glasses can you fill up with a 4.5 L pitcher?

Solve y=1/4x+5 y=2x-9

How can i be math teacher when i grow up?