A first number plus twice a second number is 2 Twice the first number plus the second totals 13 Find the numbers.

28/3 , - 11/3

Step-by-step explanation:

let the first number be x and second be y.

here,

1st case

x + 2y = 2

x= 2 - 2y (i)

2nd case

2x + y = 13

x = 13 - y / 2 (ii)

from equation i and ii

we get,

(2 - 2y ) 2 = 13-y

4 - 4y = 13 - y

4 - 13 = 4y - y

- 11 = 3y

y = - 11 / 3

now,

putting the value of y in equation( i )we get,

x = 2 - 2 * -11 / 3

=6 + 22/ 3

=28 / 3

answer: 4/6 =5/7.5

step-by-step explanation: it is based on scale and the scale between the two is 1.25. the answer is correct but i dont know if i explained it right

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.