Ineed and explanation and answer for #10.

The answer is choice C (-1, -2).

Step-by-step explanation:

For these types of problems, you need to substitute values into the equation for x and y.

Let's first try (1,2)

6x - 5y = 4?

6(1)-5(2)=4?

6-10=4?

-4≠4

So, A is not correct.

Let's try (1, -2)

6x - 5y = 4?

6(1)-5(-2)=4?

6+10=4?

16≠4

B is not correct either.

Let's try (-1, -2)

6x - 5y = 4?

6(-1)-5(-2)=4?

-6+10=4?

4=4!

Thus, the answer is choice C (-1, -2).

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.

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.