Help. Its on khan acadmy I dont know how to solve

13

Step-by-step explanation:

The coeficcent of a term xa where a is the variable is x. Thus 13a results in 13 as the coeficcent

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.