At 7pm last night, the temperature was 10. at 7am the temperature was -7 . by how
much did the temperature change from 7 p. m. to 7 a. m.

It dropped 17°

Step-by-step explanation:

If you have a number line with negative integers, and you count the difference between 10 and -7,  you get your answer!

Hope I helped : )

18a

step-by-step explanation:

simply because it is. it's the highest common factor

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.