What is the sum of 2/5 and 2/4

Plz help fast thanks

The answer is C. 9/10.

Step-by-step explanation:

Multiplying numerators and denominators to get the LCD in all fraction denominators.

= 2 × 4 2 × 5

+

5 × 4 4 × 5

Then rewrite the equation with eh equivalent fractions.

8 10

= +

20 20

With like denominators we can operate on just numerators

8 + 10

=

20

= 18

20

Simplify...

= 9

10

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.

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.