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GarryVolchara [31]
3 years ago
7

If a semi-circle is rotated about the y-axis as shown below, what three-dimensional polyhedral would be formed? a Sphere b Cone

c Cylinder d Pyramid
Mathematics
2 answers:
KatRina [158]3 years ago
7 0

Answer:

a Sphere

Step-by-step explanation:

If a semicircle is rotated about the y-axis or the axis of its diameter, the three dimensional shape produced is a sphere. A sphere is a shape in three dimension that look like a ball and when drawn in two dimension it looks like a circle. The distance from any point on the sphere to its center is always the same. A sphere has only one surface without any edges or vertices, therefore it is perfectly symmetrical.

Svet_ta [14]3 years ago
5 0

Answer:

a

Step-by-step explanation:

there needs to have a graph or something to give an idea but i hope it helps you good luck.

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This strategy works because if you subtract one number from another the sum of the two numbers should be the that is being subtracted from. (In this case, it's 200)
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Prove that :( 1 + 1/<img src="https://tex.z-dn.net/?f=tan%5E%7B2%7DA" id="TexFormula1" title="tan^{2}A" alt="tan^{2}A" align="ab
Aliun [14]

Answer:

See explanation

Step-by-step explanation:

Simplify left and right parts separately.

<u>Left part:</u>

\left(1+\dfrac{1}{\tan^2A}\right)\left(1+\dfrac{1}{\cot ^2A}\right)\\ \\=\left(1+\dfrac{1}{\frac{\sin^2A}{\cos^2A}}\right)\left(1+\dfrac{1}{\frac{\cos^2A}{\sin^2A}}\right)\\ \\=\left(1+\dfrac{\cos^2A}{\sin^2A}\right)\left(1+\dfrac{\sin^2A}{\cos^2A}\right)\\ \\=\dfrac{\sin^2A+\cos^2A}{\sin^2A}\cdot \dfrac{\cos^2A+\sin^A}{\cos^2A}\\ \\=\dfrac{1}{\sin^2A}\cdot \dfrac{1}{\cos^2A}\\ \\=\dfrac{1}{\sin^2A\cos^2A}

<u>Right part:</u>

\dfrac{1}{\sin^2A-\sin^4A}\\ \\=\dfrac{1}{\sin^2A(1-\sin^2A)}\\ \\=\dfrac{1}{\sin^2A\cos^2A}

Since simplified left and right parts are the same, then the equality is true.

3 0
3 years ago
W=9000+250t. How many gallons of water are being pumped out each hour? After 11 hours, how many gallons of water is being left i
3241004551 [841]

Answer:11750

Step-by-step explanation:

4 0
3 years ago
In 1993, the sports league introduced a salary cap that limits the amount of money spent on players' salaries. The quadratic mod
jeyben [28]

Answer:

1999

Step-by-step explanation:

y  = 0.2313(y - 1992)^2 + 2.600(y - 1992) + 35.17

verify with known data point

y  = 0.2313(2004 - 1992)^2 + 2.600(2004 - 1992) + 35.17

y  = 0.2313(12)^2 + 2.600(12) + 35.17

y  = 27.9873 + 28.6 + 35.17

y = 99.6772  which verifies our equation

65 = 0.2313x² + 2.6x + 35.17

 0 = 0.2313x² + 2.6x - 29.83

quadratic formula

x = (-2.6 ±√(2.6² - 4(0.2313)(-29.83))) / (2(0.2313))

x = (-2.6 + 5.86) / 0.4626 = 7.05 years

7.05 = y - 1992

y = 1999.05

8 0
2 years ago
$450 is deposited monthly for 11 years at 5% per year<br> FV=
Ivanshal [37]
1) montly rate, r = 5% / 12 = 0.416% = 0.00416

2) capital, C = $ 450 = present value

3) time = 11 years => number of periods = 11 * 12 = 132

4) Formula: FV = C * (1 + r) ^ (number of periods)

5) Calculation: FV = $450 * ( 1 + 0.00416)^(132) = $ 779.07

Answer: $ 779.07


6 0
3 years ago
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