how many different 3-letter "words" can be formed from the letters cannot be repeated within a 3-letter "word"?

Find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible

Which of the following circles have their centers on the x-axis? check all that apply.

What are the solutions of the equation x4 – 5x2 – 14 = 0? use factoring to solve. someone !