What number should be added to the expression x^2 + 10x to change it into a perfect square trinomial?

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

Which statements regarding efg are true? check all that apply.

What is the correct decimal form of 12%