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3 years ago

How do you add fractions? 8 1/2 + 7 1/4

1 answer:

5 0

Make the fractions into common denominators
turn 1/2 into 2/4 (common denominator of 4 with 1/4)
then add them
8+7 is 15
1/4+2/4 is 3/4
15+3/4 is 15 3/4

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Answer:

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Step-by-step explanation:

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3 years ago

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The temperature of the furnace is 1200 and cool at a rate of 15 per minute the temperature of another furnace is 900 and is heat

Hunter-Best [27]

Answer:

After 15 minutes, the temperature of both the furnaces will be same.

Step-by-step explanation:

Let $x$ be the minutes when the temperature of both becomes same.

Now, as per question:

Temperature of the furnace after $x$ minutes that is cooling at the rate of 15 degree per minute is given as:

$T=1200-15x$

Temperature of the furnace after $x$ minutes that is heating at the rate of 5 degree per minute is given as:

$T=900+5x$

Now, equating both the temperatures, we get

$1200-15x=900+5x\\1200-900=15x+5x\\300=20x\\x=\frac{300}{20}=15\ min$

Therefore, after 15 minutes, the temperature of both the furnaces will be same.

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3 years ago

Explain how 7 x 20 is similar to 7 x 2,000

zmey [24]

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3 years ago

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Solve the system by substitution.<br> -2x + 7y = 15<br> бу = 3

Salsk061 [2.6K]

Answer:

Step-by-step explanation:

-2x + 7(1/2) =15

-4x +7 =30

-4x =23

x=-23/4

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