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4 years ago

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20. Which of the following is the correct first step to solve 5x2 – 20x = -15 by completing the square?

1 answer:

kherson [118]4 years ago

3 0

Answer:

20. Which of the following is the correct first step to solve 5x2 – 20x = -15 by completing the square?

O Divide all terms by 5. this is the answer

O Divide all terms by -5.

Add 15 to both sides.

Add 100 to both sides.

5%

Step-by-step explanation:

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SOVA2 [1]

Answer:

$10000\pi$

Step-by-step explanation:

The formula for circumference is given by $2\pi r$ . Setting this equal to the circumference in the problem, we can find the radius of the sphere:

$2\pi r=100\pi, \\r=\frac{100\pi}{2\pi},\\r=50$

Now we can use the formula for the surface area of a sphere:

Surface area of a sphere: $A=4\pi r^2$

Using $r=50$ :

$A=4\cdot \pi \cdot 50^2,\\A=4\cdot 2500\cdot \pi,\\A=\boxed{10000\pi}$

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3 years ago

If a school has 200 students, how many students would be left if 5/8 of them were on a field trip.

cricket20 [7]

Answer:

75

Step-by-step explanation:

3/8 are left

3/8 x 100 = 75

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2 years ago

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Schach [20]

Answer:

Webca-mtoy.com webca-mera.io I only know 2

Step-by-step explanation:

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3 years ago

Perform the operation.<br><br> (4x² + 8) + (-8x2 – 5x + 2)

Travka [436]

Answer: −

-4x^2-5x+10

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Find the perimeter of the polygon with the vertices A (−1, 1), B (4, 1), C (4,−2), and D(−1,−2).

Brilliant_brown [7]

Given:

The vertices of a polygon are A (−1, 1), B (4, 1), C (4,−2), and D(−1,−2).

To find:

The perimeter of ABCD.

Solution:

Distance formula:

$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

Using distance formula, we get

$AB=\sqrt{(4-(-1))^2+(1-1)^2}$

$AB=\sqrt{(4+1)^2+(0)^2}$

$AB=\sqrt{(5)^2}$

$AB=5$

Similarly,

$BC=\sqrt{(4-4)^2+(-2-1)^2}=3$

$CD=\sqrt{(-1-4)^2+(-2-(-2))^2}=5$

$AD=\sqrt{(-1-(-1))^2+(-2-1)^2}=3$

Now, perimeter of ABCD is

$P=AB+BC+CD+AD$

$P=5+3+5+3$

$P=16$

Therefore, the perimeter of ABCD is 16 units.

5 0

3 years ago