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Montano1993 [528]
3 years ago
14

Find the total surface area of this cone.

Mathematics
1 answer:
jekas [21]3 years ago
3 0

Answer:

36 pi

Step-by-step explanation:

pi r l + B

pi (4) 5 + pi (16)

36 pi

(l is solved by 4^2 + 3^2)

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Calculate the double integral. (30x2y3 − 25y4) da, r = {(x, y) | 0 ≤ x ≤ 1, 0 ≤ y ≤ 1} r
Vladimir [108]

Answer:

-2.5

Step-by-step explanation:

We want to evaluate the double integral,

\int \int _R (30x^2y^3-25y^4)dA

where R is the rectangular region bounded by R={(x, y) | 0 ≤ x ≤ 1, 0 ≤ y ≤ 1}

We apply the limits to obtain;

\int_0^1 \int _0^1 (30x^2y^3-25y^4)dxdy

We evaluate the inner integral by integrating with respect to x whiles treating y as a constant.

\int_0^1 (10x^3y^3-25y^4x)_0^1dy

This gives us,

\int_0^1 (10y^3-25y^4)dy

We evaluate the resulting integral now to obtain;

10(\frac{y^4}{4})-25(\frac{y^5}{5})|_0^1

2.5y^4-5y^5|_0^1=2.5-5=-2.5

3 0
4 years ago
The variables x and y vary directly. Write an equation that relates x and y, when x = 4 and y = 2
Sholpan [36]
Since x & y vary directly  (it means when x increases, y increases & vice versa)
Then the equation==> y = k.x (k is a constant to be calculated)

But x=4 and y= (given) ==> 2=4k or k= 1/2 & the equation becomes <span>y=1/2 (x)</span>
8 0
4 years ago
A circular garden with a radius of 8 feet is surrounded by a circular path with a width of 3 feet.
Nadusha1986 [10]

Answer: area of the path alone is 178.98 ft²

Step-by-step explanation:

Since the circular garden is surrounded by a circular path, two circles are formed.

The formula for determining the area of a circle is expressed as

Area = πr²

Where

r represents the radius of the circle.

π is a constant whose value is 3.14

Considering the circular garden,

Radius = 8 ft

Area = 3.14 × 8² = 200.96 ft²

Considering the circular garden and the circular path together,

Radius = 8 + 3 = 11 ft

Area = 3.14 × 11² = 379.94 ft²

Area of the path alone is the circular garden and the circular path together - area of circular path

It becomes

379.94 - 200.96 = 178.98 ft²

5 0
3 years ago
Please answer- what is the length of BW? ANSWER DIRECTLY NO LINK ( will give brainlist to whoever answers)
Yuki888 [10]

Answer:

148.49

Step-by-step explanation:

105 x √2 = 148.49

have a great day

4 0
3 years ago
How would you find the width of a golden rectangle if your givin the length?
Nesterboy [21]
A golden rectangle is a rectangle whose length and width follow the golden ratio (about 1:1.618).

Given the length, you would divide by 1.618 to find the width.

Edit: The exact value is \frac{  1+\sqrt{5} }{2}, but 1.618 should suffice. 
5 0
4 years ago
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