Find x on this triangle

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

11. a particular type of cell doubles in number every hour. which function can be used to find the number of cells present at the end of h hours if there are initially 4 of these cells? a. n = 4 ()" b. n = 4(2)" c. n = 4 + (2)" din = 4 +"

Does anyone know how to do geometryme with this problem