Have to find the missing side using trigonometry ratios

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Nikita wants to apply for student aid to fund her college education. arrange the steps involved in nikita’s application for financial aid