Which number is a solution to the inequality x+4< 7

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

What is the factor form of x^2-9x+14

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?