Afurniture builder who has been commissioned to custom build some bookcases. he goes and measures the space but only had a meter stick with him. finds that the length is 2 meters, the height is 4 meters and the depth is 50 centimeters.

you are to build the shell of the bookcases. you can only buy lumber in 1 inch by 12 inches by 8 feet though. if each plank costs $18.00 how much will the materials cost the customer?
a) $144.00
b) $198.00
c) $702.00
d) $720.00

Hey there!
These are the steps involved:

1. Write out the equation.
13=2f+5

2. Turn around the equation.
2f+5=13

3. 2f+5-5=13-5
Subtract 5 from both sides.

4. 
Divide each side by 2 to simplify.

5. Once you divide, you get:
f=4

So, the final answer is 4!

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