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2 years ago

a which family uses about twice the amount of electricity per person than the other two families? Explain your reasoning.

Mathematics

2 answers:

tia_tia [17]2 years ago

7 0

i dont understandStep-by-step explanation:

pantera1 [17]2 years ago

7 0

Answer:

The Stiles family; the Melendez family uses 390 kWh per person, the Barton family uses 355 kWh per person, and the Stiles family uses 745 kWh per person.

Step-by-step explanation: im preety sure ¯\_(ツ)_/¯

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A metallurgist has one alloy containing 34% copper another containing 48% copper. How many pounds of each alloy must he use to m

Zielflug [23.3K]

Answer:

<h2>36.14 pounds of 34% copper alloy and 9.86 pounds of 48% copper alloy</h2>

Step-by-step explanation:

First alloy contains 34% copper and the second alloy contains 48% alloy.

We wish to make 46 pounds of a third alloy containing 37% copper.

Let the weight of first alloy used be $x$ in pounds and the weight of second alloy used be $y$ in pounds.

Total weight = $46\text{ }pounds=x+y$ $-(i)$

Total weight of copper = $37\%\text{ of 46 pounds = }34\%\text{ of }x\text{ pounds + }48\%\text{ of }y\text{ pounds }$

$\dfrac{37\times 46}{100}=\dfrac{34x}{100}+\dfrac{48y}{100}\\\\ 34x+48y=1702$ $-(ii)$

Subtracting 34 times first equation from second equation,

$34x+48y-34x-34y=1702-34\times46\\14y=138\\y=9.857\text{ }pounds \\x=36.143\text{ }pounds$

∴ 36.14 pounds of first alloy and 9.86 pounds of second alloy were used.

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3 years ago

Determine the place value of the digit 2 in the following whole number: 3,204,000

andrey2020 [161]

The hundred thousand place

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3 years ago

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Find the value of x and y of the equilateral triangle. I need it ASAP

katrin2010 [14]

Answer:

x=12, y=30

Step-by-step explanation:

to find x:

in a equilateral triangle, all three sides are congruent, so:

4x-4=3x+8

x-4=8

x=12

to find y:

in an equilateral triangle, all the angles are 60°, so:

2y=60

y=30°

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2 years ago

Problem Page Donna had 2/7 acres of land. She planted 4/5 of it with corn. How many acres did she plant with corn?

Dafna11 [192]

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3 years ago

How many lines of symmetry does a regular decagon have?<br><br> 8<br><br> 10<br><br> 11<br><br> 12

bixtya [17]

The number of sides is the same as the number of lines of symmetry and the order of rotational symmetry.

So, a regular decagon would have 10 lines of symmetry.

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3 years ago

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