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4 years ago

10

Please be quick, i need this as soon as possible!

1 answer:

sashaice [31]4 years ago

7 0

Answer:

Distributive property

Why?

Because you are distributing the 3.

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-1\2x+1y=3/4, y-2x=3 , do I divide all the fractions by 4 to get rid of the fraction or by 2?

Law Incorporation [45]

You <em>multiply</em> both sides of the first equation by 4.
Then you have . . .
-2x + 4y = 3 and y - 2x = 3 .

If you want to get rid of a fraction, you multiply it by itsdenominator.
BUT ... whatever you do to one term on one side of the equation, you
have to do the same to <em>all</em> the terms on that side, AND then you have to
do the same thing to all the termson the OTHER side.

4 0

3 years ago

A hemispherical tank is filled with water and has a diameter of 6 feet. If water weighs 62.4 pounds per cubic foot, what is the

masha68 [24]

Answer:

The total weight of the water in a full tank, to the nearest pound is 3527 pounds per cubic foot

Step-by-step explanation:

Given:

Diameter of the hemispherical tank = 6 feet

Weight of water per cubic foot = 62. 4 pounds

To Find:

The total weight of the water in a full tank, to the nearest pound?

Solution:

We know that the volume of a sphere is:

$V =\frac{4}{3}\pi r^3$

where

r = is the radius

In the question we are given with diameter,

So

$radius = \frac{diameter}{2}$

radius = $\frac{6}{2}$

Radius = 3

We need the volume of the hemisphere

So the volume of the hemisphere will be half of the volume of teh sphere

$\frac{V}{2} = \frac{2}{3}\pi r^3$

Thus the volume of the hemisphere is

$V =\frac{2}{3} \pi r^3$

Now substituting the values

$V = \frac{2}{3} \pi(3)^3$

$V = \frac{2}{3}\pi(27)$

$V = \frac{54 \pi}{3}$

$V = \frac{169.56}{2}$

V= 56.52 cubic foot

Now, the total weight of water of:

W = 56.52 x 62.4

W= 3526.848 pounds per cubic foot

To the nearest pounds

W= 3527 pounds per cubic foot

5 0

3 years ago

In the cafeteria 100 milk cartons were put out for breakfast. After breakfast there were 40 milk cartons left. What is the ratio

cupoosta [38]

Answer:

The ratio of milk cartons left over to milk cartons taken is <u>2:3.</u>

Step-by-step explanation:

Given:

In the cafeteria 100 milk cartons were put out for breakfast.

After breakfast there were 40 milk cartons left.

Now, to find the ratio of milk cartons left over to milk cartons taken.

Total cartons of milk put out for breakfast = 100.

<em>Cartons of milk left over after breakfast = 40.</em>

So, to get the cartons of milk taken by subtracting cartons of milk left after breakfast from total cartons of milk put out for breakfast:

$100-40\\\\=60.$

<em>Thus, cartons of milk taken for breakfast = 60.</em>

Now, to get the ratio of milk cartons left over to milk cartons taken:

$40:60$

$=\frac{40}{60}$

<em>On simplifying it:</em>

$=\frac{2}{3}$

$=2:3.$

Therefore, the ratio of milk cartons left over to milk cartons taken is <u>2:3.</u>

6 0

3 years ago

A plank is 2m long and30cm wide has volume of 0.018m. what is its thickness

matrenka [14]

I think the thickness of the plank is 0.03m

6 0

3 years ago

The growth of an island in a seaward direction may be modeled as 8y+2 cm, where y represents the number of years that the lava f

Karo-lina-s [1.5K]

The lava has flowed for 7.25 years.

8•7.25+2=60

3 0

4 years ago