How many different committees can be formed from 6 teachers and 37 students if the committee consists of 4 teachers and 4 ​students?

Only 1 committee can be formed.

Step-by-step explanation:

There are only 6 teachers to start. If one committee requires 4 teachers then after that one is formed, only 2 teachers would be left. Since 2 teachers is not on par with the requirement (4 teachers per committee), only 1 committee can be formed.

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.