For question 4 pls me , show work step by step

c=6.40 units

Step-by-step explanation:

The given triangle ABC is a right triangle;

According to the Pythagoras Theorem;

We substitute AC=5 and BC=8

c=6.40 to two decimal places.

In a right triangle the two acute angles add up to 90 degrees.

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.