Can y’all help me on question 16?!

What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3