# ELITRICAL MATH! (LAST ONE FOR TODAY, HOPEFULLY!)

Find each unit price. Which is the better buy? Explain.

Electrical wire:

\$1.49 for 3 ft.

\$.69 for 18 in.

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1. divide cost/quantity

\$1.49/3ft = \$0.4967/ft

and similarly for the other one. Then compare

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2. depends on how much wire you need.
one is almost 50cents per foot, the other is almost 46 cents per foot.

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3. How did you get 46?

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4. 0.69 / 1.5 = 0.46

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5. 1.49/3 = x/1
cross multiply
3x = 1.49
x = 1.49/3
x = 0.496 (rounds to 50 cents per foot)

.69/18 = x/1
cross multiply
18x = .69
x = .69/18
x = .038 per inch
12 inches in a foot
x = .038(12) = 0.456 (rounds to 46 cents per foot)

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6. 1.49/3 = 0.50 per foot
0.69/1.5 = 0.46 per foot

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7. Thanks blurryface! That really helped! :D

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8. Thank you that did help.

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9. help please i still dont get it :/

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10. Yes that was helpful blurryface, thank you.

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11. How did y’all get 1.5??

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12. its inches so that means that 1.49 is the better one

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13. what does the slash mean? multiply or divide?

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14. Divide. If their was a semicolon ( • ) it would mean multiply. But in math these symbols mean divide, /, ÷,

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15. whats going on i dont get in :((((

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