Which value must be added to the expression x^2+16 to make it a perfect square trinomial

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

Vinay constructed this spinner based on the population of teachers at his school according to vinays model what is the probability that he will have a male history teacher two years in a row

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²