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3 years ago

Which is the best to buy?

Mathematics

1 answer:

Sveta_85 [38]3 years ago

6 0

Answer: C

You want to find out the cost per ounce.

2.4/16 = 15 cents per oz

2.8/20 = 14 cents per oz

3/24 = About 13 cents per oz (0.125)

2/12 = About 17 cents per oz (1.66666667)

<u>The cheapest one is C, about 13 cents per oz.</u>

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Jordan can build a birdhouse in 2 hours. If it takes her sister 3 hours to build a birdhouse, how long will it take them to buil

miskamm [114]

To find the total work of two people at different speeds, we need to find a common speed limit to both.

In this case, Jordan can build a birdhouse in 2 hours so her speed is 1/2 birdhouse per hour.

For the sister, it takes 3 hours to build a birdhouse so her speed is 1/3 birdhouse per hour.

To find what they can do in one hour: $\frac{1}{3} + \frac {1}{2} = \frac{2}{6} + \frac{3}{6} = \frac{5}{6}$

To find how long does it take to build a birdhouse: $\frac{ \frac{5}{6}}{1} = \frac{1}{x}$

Set the denominators equal: $\frac{\frac{5}{6}x}{x} = \frac{1}{x}$

Remove the denominators and solve: $\frac{5x}{6} = 1$

Once again set the denominators equal: $\frac{5x}{6} = \frac{6}{6}$

Remove the denominators and solve for x: $5x = 6 \\ \\ x = \frac{6}{5}$

6/5 hours is equal to 72 minutes.

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Answer:

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2 years ago

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stealth61 [152]

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32. (a^7)^5 = a^(7 * 5) = a^35
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38. (4y^3)^2 = 4^2 y^(3 * 2) = 16y^6
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