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3 years ago

2/4 - 2/7 in simplest form

Mathematics

1 answer:

prisoha [69]3 years ago

7 0

2/4 = 1/2

1/2 - 2/7 LCD of 2 and 7 is 14

7/14 - 4/14 = 3/14

thats the answer

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Which is a solution to the equation?<br> (x-2)(x + 5) = 18

anastassius [24]

The first one is correct!

6 0

3 years ago

If the ratio of two numbers is 5:2, what is the ratio of their sum to their difference?

Kipish [7]

Answer:

7/3

Step-by-step explanation:

Let the two numbers be x and y which are relatively prime to each other.

a/b = 5/2

So you want the ratio of

(a + b) / (a - b)

Take out a common factor of b
numerator: b(a/b + 1)
denominator: b(a/b - 1)
Put them together
The b's cancel out
(a/b + 1) / (a/b - 1)
but a/b = 5/2
(5/2 + 1) / (5/2 - 1)
Numerator: (5/2 + 2/2) = 7/2
Denominator: 5/2 - 2/2 = 3/2
numerator over denominator = 7/2 // 3/2 = 7/2 * 2/3 = 7/3

Answer: 7/3

Nice problem: Thanks for posting.

8 0

3 years ago

Choose the two number sentences that are true.

Inessa05 [86]

Answer:

because 12+7=19

5+14=19

3 0

3 years ago

You're saying 5/6 + 7/8 has the greatest possible value.

ollegr [7]

Answer:

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4 0

3 years ago

A solid metal cube of side 1-2 cm has a mass of 15 grams.

sashaice [31]

Answer:

The mass of the second cube is about 1085.07 grams.

Step-by-step explanation:

I assume '1-2 cm' means 1.2cm here. Correct me if I am wrong and I'll edit my answer.

First, find the density of this cube:

$d=\frac{m}{v}$

where d is density, m is mass, and v is volume.

We have one of those, but we also need volume. The volume of a cube is just:

$v=a^3$

where a is the length of a side.

$\rightarrow v=1.2^3\\\rightarrow v=1.728$

The volume of this cube is 1.728cm³. Now, you can find the density;

$\rightarrow d=\frac{15}{1.728}\\\rightarrow d\approx8.6806$

The density of this material is about 8.68 grams per cubic centimeter.

Finally, you can use that density to find the mass of the other cube. Fin the volume of the second cube:

$\rightarrow v=5^3\\\rightarrow v=125$

The volume is 125cm³. Given the density and the volume, you can calculate the mass:

$\rightarrow d=\frac{m}{v}\\\rightarrow 8.6806=\frac{m}{125}\\\rightarrow 8.6806\times125=m\\\rightarrow m=1085.0694$

The mass of the second cube is about 1085.07 grams.

4 0

3 years ago