Urgent do 19-21 will mark brainliest

Question 19: x=9

Question 20: r<-6

Step-by-step explanation:

For question 19, the answer is nine because if you first add 5to both sides, it would be 18= 2r. If you divide both sides by 2, you would get 9=r. For question 20, if you subtract 7 on each side, you would get -2r=12 if you divide -2 on each side, r would be -6.

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.