Please help me with this I will give brainliest. Find the value of x. Round to the nearest tenth

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 its length what is the length of lewis's basement

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

Which number line correctly shows 0.8 + 0.3?