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2 years ago

Please help! this is for math

Mathematics

1 answer:

kobusy [5.1K]2 years ago

8 0

Answer:

Step-by-step explanation:

x=17

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The radius of a cylinder is doubled and its height is halved. Find the ratios of their surface areas.

Inessa [10]

Answer: 1:1

Step-by-step explanation:

Let r be the radius and h be the height of a cylinder.

Formula: Curved surface area of cylinder = $2\pi rh$

Now, if radius of a cylinder is doubled and its height is halved, then new radius will be R= 2r and new height will be $H=\dfrac{1}{2}$

Now, new surface area = $2\pi RH= 2\pi(2r)\dfrac{h}{2}= 2\pi rh$

Ratio of curved surface areas : $\dfrac{\text{Surface area}}{\text{New surface area}}=\dfrac{2\pi rh}{2\pi rh}=\dfrac{1}{1}$

Hence, the ratios of their surface areas = 1:1 .

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2 years ago

What is 1875 ÷ 125 (show ur work long divison)

Colt1911 [192]

Answer:

15 R7

Step-by-step explanation:

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32/ 487

0

32

167

160

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2 years ago

Mr. Wolfe builds a new deck in the shape shown below. Explain how to find the area of the deck, and solve.

kifflom [539]

Answer:

144

Step-by-step explanation:

your welcome

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3 years ago

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Find the area of the triangle if the length is 22 and the height is 15

Ymorist [56]

Answer:

low 0.5 *the length of the base * the height

Step-by-step explanation:

0.5*22*15=165

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2 years ago

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4. DECK is a parallelogram. Find the values of x and y.

Darya [45]

Answer:

The value of x = 5 and y = 2.

Step-by-step explanation:

Here, given DECK is a parallelogram.

Also, KT = 2x + y , DT = x + 2y , TE = 12 and TC = 9

Now, in parallelogram:

DIAGONALS IN A PARALLELOGRAM BISECT EACH OTHER

Also, in the parallelogram DECK,

Sides DC and KE are two diagonals.

⇒ T is the mid point of AC and KE.

⇒ KT = TE and DT = TC ( as diagonals are bisected)

⇒ 2 x + y = 12 and x + 2y = 9

So here, the set of two equations are:

2 x + y = 12 ....... (1)

x + 2 y = 9 ....... (2)

Multiply (2) with -2 and add with (1), we get:

2 x + y - 2 x - 4 y = 12 - 18

or, - 3 y = - 6

or, y = 2

If y = 2, then x + 2 (2) = 9 or, x = 5

Hence the values of x = 5, y = 2

6 0

3 years ago