At a dog show there are 7 dogs competing for Best of Show. In how many orders can the judge pick out and rank the top 3 dogs?

Answer question above and explain each step : )

Find the value of x for which abcd must be a parallelogram -9-6x x-30

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. 4x^2 + 20x + 25 = 0