Twenty planes are at an airport. eight planes take off, then five planes land, then 7 more take off, then 9 land. how many planes are left at the airport?

your awnser is 19

sorry twenty character thing

The answer is 19 planes left.  

Hope I helped!

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.

98%

step-by-step explanation: