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3 years ago

PLEASE SOMEONE HELP ME OUT which would be the correct equations and how do i solve it? I'll Mark the brainlelist !

Mathematics

2 answers:

sp2606 [1]3 years ago

7 0

Answer:

4 1/4

4 2/8

Step-by-step explanation:

1 7/8 + 2 3/8 = 4 1/4

4 1/4 = 4 2/8

MrMuchimi3 years ago

5 0

Hello from MrBillDoesMath!

Answer:

Choices 1, 2, and 4 are correct.

Discussion:

1 7/8 + 2 3/8 =

1 + 2 + ( 7/8 + 3/8) =

1 + 2 + 10/8 =

3 + (1 + 2/8) =

4 1/4

The first choice in the top row is precisely that value. (It is correct)

The second row is also correct as 34/8 = 17/4 = 4 1/4

The third choice is incorrect as the sum shown (4/8) = 1/2 not 4 1/4

The fourth choice is correct as 4 2/8 = 4 1/4

The fifth choice is incorrect as 3 21/8 = 3 + 2 + 5/8 <> 4 1/4

MrB

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Monica [59]

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3 years ago

The sum of 5 times a number and <br> minus −2, plus 7 times a number

Olenka [21]

Answer:

12x + 2

Step-by-step explanation:

Let the number be represented by x.

Then five times the number = 5*x

Seven times the number = 7*x

Sum of 5 times the number minus -2 = $5*x - (-2)$ = $5x +2$

Adding seven times the number to this expression yields, $5x+2+7x$

$= (5+7)x+2$

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So the simplified expression corresponds to 12x + 2.

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3 years ago

2. The ratio of radii of two cylinders is 1:2 and heights are in the ratio 2:3. Find the ratio of their volumes.

Savatey [412]

Answer: $\frac{1}{6}$ or $1:6$

Step-by-step explanation:

The volume of a cylinder can be found with the following formula:

$V=\pi r^2h$

Where "r" is the radius and "h" is the height of the cylinder.

In this case, let be:

- $V_1$ the volume of one of this cylinders and $V_2$ the volume of the other one.

- $r_1$ the radius of the first one and $r_2$ the radius of the other cylinder.

- $h_1$ the height of one of them and $h_2$ the height of the other cylinder.

Then:

$V_1=\pi r_1^2h_1\\\\V_2=\pi r_2^2h_2$

Therefore, you know this:

$\frac{V_1}{V_2} =\frac{\pi r_1^2h_1}{\pi r_2^2h_2}$

Simplifying, you get:

$\frac{V_1}{V_2} =\frac{ r_1^2h_1}{ r_2^2h_2}$

Now, knowing the ratios given in the exercise, you can substitute them into the equation:

$\frac{V_1}{V_2} =\frac{1^2*2}{ 2^2*3}$

Evaluating, you get:

$\frac{V_1}{V_2} =\frac{2}{ 4*3}\\\\\frac{V_1}{V_2} =\frac{2}{12}\\\\\frac{V_1}{V_2} =\frac{1}{6}$

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3 years ago

Draw to show how you can use models to compare 345 and 391.

Trava [24]

I have drop in a file for u to see it.

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3 years ago

How much of earth's surface is covered by water,including both salt and fresh water?

Crank

Answer:

About 71% of Earth's surface is covered in water.

Step-by-step explanation:

About 97% of Earth's water is salt water.

About 3% of Earth's water is fresh water.

7 0

3 years ago