Finding an irrational number between which given pair of numbers supports the idea that irrational numbers are dense in real numbers?

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?