What is the approximate area of a semicircle with diameter of 22 inches

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122