Pls!
1) place a second set of parenthesis in the expression below so that the value of the expression is -15
5-20 \div (-5) times 2-7
2) jon makes pillow covers. each pillow cover uses 3/4 yard of fabric. how many complete pillow covers can he make from 7 1/8 yards of fabric?
3) carmella has a length of 24 feet of wallpaper border. she wants to put the border around the walls of a room with dimensions of 61 3/4 inches and 74 1/8 inches. estimate how much of the border she needs. does she have enough of the border?
pls explain! you very much : )

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.

the population of other specie of birds will decline or other specie of birds will find some alternate source of food to survive.

explanation:

according to the competitive exclusion principle, which is also known as gause's law, two specie living in the same niche and feeding on the same resource cannot co-exist stably.

as we have well studied the theory of natural selection which states that only those organisms survive which have better tendency to compete for food and adapt to the environmental conditions.

coming towards the question, what wi ll happen when one species outcompetes the other for the small fish , the other specie will not get enough food and will start to die or decline in population. eventually either other specie needs to find another alternative food source for itself or migrate at some other location where there is less competition otherwise it will just not exist anymore at that niche.

hope it !

the answer is 21%.