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2 years ago

Please help, i really suck at geometry

Mathematics

2 answers:

Alex Ar [27]2 years ago

7 0

Have you found the answer?

zepelin [54]2 years ago

5 0

Answer:

1) In order to fill 2/3 of the vase, you would need 72 $\pi$ of water.

Step-by-step explanation:

In order to find this, use the volume formula for a cylinder.

V = $\pi$ r^2h

Now input the data

V = $\pi$ (3)^2(12)

V = $\pi$ (9)(12)

V = 108 $\pi$

Now since we have the volume of the whole thing, we can multiply by 2/3 to get 2/3 of the overall volume.

V = 108 $\pi$ * 2/3

V = 72 $\pi$

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Perpendicular lines are two distinct coplanar lines that intersect to form what type of angle?

11111nata11111 [884]

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2 years ago

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The circle shown has center o and radius 4. what is the area of the shaded region?

Vlad [161]

The ratio of his savings: expenses = 7: 5

So, total of the ratio is = 7 +5 =12

His savings will be 7/12* allowance

His expenses will be 5/12 * allowance

We know that the allowance that he gets is $3

His savings = 7/12 * allowances

His savings = 7/12 * 3

His savings = $7/4 or 1 ¾

Now, we convert the 7/4 (or 1 ¾) into a decimal.

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His Savings = $1.75

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2 years ago

Which I greater? 165 cm or 1.7 meters?

viktelen [127]

165cm in feet is 5.41 feet.

1.7m in feet 5.58 feet

So 1.7m is greater, I hope this helps.

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2 years ago

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What are the roots of x in -10x2 + 12x − 9 = 0?

hoa [83]

Answer:

$x_1=\frac{3(2+i\sqrt{6})}{10}$

$x_2=\frac{3(2-i\sqrt{6})}{10}$

Step-by-step explanation:

Use the Quadratic formula:

$x=\frac{-b\±\sqrt{b^2-4ac}}{2a}$

You can identify that, in this case:

$a=-10\\b=12\\c=-9$

Now you need to substitute these values into the formula:

$x=\frac{-12\±\sqrt{12^2-4(-10)(-9)}}{2(-10)}$

$x=\frac{-12\±\sqrt{-216}}{-20}$

Remember that:

$i=\sqrt{-1}$

Therefore,rewriting and simplifying, you get:

$x=\frac{-12\±6i\sqrt{6}}{-20}$

$x=\frac{-6(2\±i\sqrt{6})}{-2(10)}$

$x=\frac{3(2\±i\sqrt{6})}{10}$

Then, you get the following roots:

$x_1=\frac{3(2+i\sqrt{6})}{10}$

$x_2=\frac{3(2-i\sqrt{6})}{10}$

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2 years ago

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Help me please, It's not 20 or 75

jenyasd209 [6]

A+B+C+D+E=540°

4X+5+7X+6X+10+5X-5+4X+10=540

26X = 520

X = 520 : 26 = 20°

E = 4X + 10 = 80 + 10 = 90 °

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2 years ago