### 18seconds.org Promotes ENERGY STAR CFL Usage

For GDT, the benefits derived from using CFL are difficult to believe, yet he is convinced that published benefit information is accurate. The following indented text was copied from the 18seconds.org website.

```   "[...] one small action -- taking 18 seconds to change a
conventional incandescent bulb to an ENERGY STAR labeled
compact fluorescent light bulb (CFL) -- can significantly
reduce environmental impact."

[...]

"The 18seconds network is a broad group of companies,
government entities, non-governmental organizations,
religious groups, academic institutions and individuals
working together to educate Americans about the electric
cost-savings and environmental benefits of CFLs, which
require 1/3 the energy of traditional bulbs to provide
the same amount of light. According to the Environmental
Protection Agency, a member of the network, if every American
swapped just one bulb for an ENERGY STAR labeled CFL, it would
collectively save them more than \$8 billion in energy costs,
prevent burning 30 billion pounds of coal, and keep two million
cars worth of greenhouse gas emissions from entering the atmosphere."

[...]

"Converting one conventional 60W bulb to a 13W ENERGY STAR labeled
CFL can save: \$30 or more in electric costs over its lifetime;
five or more conventional bulbs from being produced, transported
and discarded in a landfill; 110 lbs. of coal from being burned;
and 450 lbs. of greenhouse gases from reaching the atmosphere.
The average home has more than 30 light fixtures, and since
ENERGY STAR labeled CFLs last an average of five to seven years,
that means even more potential savings."
```

The 18seconds.org website was built by Yahoo!

##### Exercises
1. `18 seconds` is `______%` of a minute. [record answer to nearest hundredth; 1 minute = 60 seconds]

2. Zelmo changed five regular light-bulbs to CFL and, on average, it took him `18 seconds per bulb`. In total, Zelmo spent `______ minute(s)` and `_______ second(s)` of time changing his light-bulbs.

3. 18seconds.org states: "ENERGY STAR labeled CFLs last an average of five to seven years." The average of the average ENERGY STAR CFL's life-span is `________ years`.

4. List the prime factors of `18`.

5. `18` equals `10` raised to the 1st power plus `2` raised to the `_____` power.

6. `18 seconds` equals `_______________ nanoseconds`.