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antiseptic1488 [7]
3 years ago
15

The surface area of a cube is 2.535 m2.

Mathematics
1 answer:
baherus [9]3 years ago
5 0
Given:
Surface area of a cube = 2.535 m²

convert square meters to square centimeters:
1 square meter = 10,000 square centimeters

2.535 m² * 10,000 cm²/m² = <span>25,350 cm²


</span><span>B.The number representing the surface area would increase.
(from 2.535 to 25,350)
</span>
E.<span>The actual surface area would stay the same.
</span>(only the units used differ).

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How many pounds of a 15% copper alloy must be mixed with 700lb of a 30% copper alloy to maybe a 25.5% copper alloy
lisov135 [29]

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300\; \rm lb.

Step-by-step explanation:

Let x represent the mass (in pounds) of that 15\% copper alloy required, such that the final mixture would contain 25.5\% copper by mass.

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Therefore, the mixture would contain (210 + 0.15\, x) \; \rm lb of copper.

The mass of that mixture would be (700 + x)\; \rm lb. The mass fraction of copper in that mixture would be:

\displaystyle \frac{(210 + 0.15\, x)\; \rm lb}{(700 + x)\; \rm lb} \times 100\%.

This ratio is supposed to be equal to 25.5\%. These two pieces of equations combine to give an equation about x:

\displaystyle \frac{(210 + 0.15\, x)\; \rm lb}{(700 + x)\; \rm lb} \times 100\% = 25.5\%.

\displaystyle \frac{210 + 0.15\, x}{700 + x} = 0.255.

Simplify and solve for x:

210 + 0.15\, x= 0.255\, (700 + x).

(0.255 - 0.15)\, x= 210 - 0.255 \times 700.

\displaystyle x = \frac{210 - 0.255 \times 700}{0.255 - 0.15} = 300.

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2 years ago
Joe is responsible for reserving hotel rooms for a company trip. His company changes plans and increases how many people are goi
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Answer:

<h2>He is going to pay 40*900= $36000 for the reservation</h2>

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We are told that they need at least 50 total rooms.

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