Find the width of the rectangular prism when the surface area is 208 centimeters

Use the surface area formula of a rectangular prism to find the width. (I have changed it to use the same terms given in the problem).

A

=

2

(

d

w

+

h

w

+

h

d

)

Because of the given information, it is known that:

A

=

208

h

=

8

d

=

6

The width is not know, so let it keep it's variable

w

. But substitute the other values into the equation:

A

=

2

(

d

w

+

h

w

+

h

d

)

208

=

2

[

6

w

+

8

w

+

(

8

)

(

6

)

]

208

=

2

(

14

w

+

48

)

Use the distributive property to solve the right side of the equal sign:

208

=

2

(

14

w

+

48

)

208

=

28

w

+

96

112

=

28

w

112

28

=

w

4

=

w

The width is

4

.

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.