What is the LEAST COMMON MULTIPLE of 3 and 5

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

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

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?