Find the missing length of the triangle 9ft , 40ft

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.

1: 4 if the wew 35 surfboards at the beach how many were short boards?

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?