What’s the constant term in the above expression represent ?

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?

If a=0.333333 and b=0.55555, what is the value of a+b

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )