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3 years ago

Someone please help meeeee

Mathematics

1 answer:

zepelin [54]3 years ago

4 0

Answer:

The number is -1

Step-by-step explanation:

The equation for the first part is (2n+7)2. This is because "twice a number" is 2n and "7 is added" will make it 2n+7. The "sum is multiplied by two" Is multiplying everything by two. This will make it (2n+7)

The second part is -8n+2. Since a number is multiplied by negative eight it will be -8n. Then it is added by two.

Both equation equal each other the overall equation will be (2n+7)2=-8n+2

You will distribute. making it 4n+14=-8n+2

Add 8n to both sides making it 12n+14=2

subtract 14 from both sides making it 12n=-12

Divide both sides by 12 . making it number=-1

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Can someone help me with this 1 math problem. I posted a picture of the question.

NeX [460]

Step-by-step explanation:

For conical part: h = 14 in & r = 9 in

For hemispherical part: r = 9 in

$V_{prop} = V_{cone} +V_{hemisphere} \\ = \frac{1}{3} \pi {r}^{2} h + \frac{2}{3} \pi {r}^{3} \\ =\frac{1}{3} \times 3.14 \times {9}^{2} \times 14 + \frac{2}{3} \times 3.14 \times {9}^{3} \ \\ = 1,186.92 + 2 \times 3.14 \times 243 \\ = 1,186.92 + 1,526.04 \\ = 2,712.96 \: {inch}^{3} \\$

Another way:

$V_{prop} = V_{cone} +V_{hemisphere} \\ = \frac{1}{3} \pi {r}^{2} h + \frac{2}{3} \pi {r}^{3} \\\\=\frac{1}{3} \pi {r}^{2}(h+2r)\\\\= \frac{1}{3}\times 3.14\times {9}^{2}(14+2\times 9)\\\\= \frac{1}{3}\times 3.14\times 81(14+18)\\\\= 3.14\times 27\times 32\\\\= 2,712.96\: {inch} ^3$

4 0

3 years ago

Simplify the given equation.

Ede4ka [16]

Answer:

Part 1) $4-7x=15$

The value of x is $-\frac{11}{7}$

Part 2) $x=27$

Step-by-step explanation:

Part 1) Simplify the given equation

we have

$6 - (3x + 10)+4(2 - x)=15$

In the left side, remove the parenthesis and apply the distributive property

Remember that

$(-1)(+1)=-1\\(-1)(-1)=+1$

$6 -3x-10+4(2)-4(x)=15$

$6 -3x-10+8-4x=15$

Combine like terms left side

$4-7x=15$

Adds 7x both sides

$4=15+7x$

subtract 15 both sides

$-11=7x$

Divide by 7 both sides

$x=-\frac{11}{7}$

Part 2) Solve for x.

$5(x + 1) = 4(x + 8)$

Apply distributive property both sides

$5x+5=4x+32$

Group terms that contain the same variable

$5x-4x=32-5$

Combine like terms

$x=27$

6 0

3 years ago

The volume (in cubic meters), vvv, of a rectangular prism is given by the expression: v = a^4-2a^2b^2+b^4v=a 4 −2a 2 b 2 +b 4 v,

zhannawk [14.2K]

Answer:

${a}^{2} - {b}^{2}$

$a - b$

$a + b$

Step-by-step explanation:

The given expression that represents the volume of the rectangular prism is:

$v = {a}^{4} - 2 {a}^{2} {b}^{2} + {b}^{4}$

We can rewrite this to reveal a perfect square pattern.

$v =( { {a}^{2}) }^{2} - 2 {a}^{2} {b}^{2} + ( {b}^{2})^{2}$

We factor using perfect squares to obtain:

$v = ( {a}^{2} - {b}^{2} )^{2}$

$v = ( {a}^{2} - {b}^{2} )( {a}^{2} - {b}^{2} )$

Volume is three dimensional so we need a third factor different from 1.

We further factor one of the difference of two squares to get:

$v = ( {a}^{2} - {b}^{2})(a - b)(a + b)$

So pick the following unique dimensions from the possible answers:

${a}^{2} - {b}^{2}$

$a - b$

$a + b$

6 0

2 years ago

Can someone help me ? I can’t seem to get it :/

ale4655 [162]

I believe it is c but im not positive

4 0

3 years ago

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Alja [10]

Answer:

Step-by-step explanation:

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7 0

3 years ago