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Crazy boy [7]
3 years ago
11

If a sphere's surface area is doubled, what is the corresponding change in radius?

Mathematics
2 answers:
geniusboy [140]3 years ago
6 0
The radius is increased by \sqrt(2) times, so b must be the missing choice that we're looking for. The formula for sphere's surface area is 4*pi*r^2. When r is increased to be \sqrt(2)*r, the new surface area becomes 4*pi*(2*r^2)=8*pi*(r^2), doubling the original surface area.
Sonbull [250]3 years ago
5 0
The radius is increased by  sqrt2  times  

It must be b
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Vanyuwa [196]

Answer:

a. 208.5 ft.

b. 144.9 ft.

Both correct to the nearest tenth.

Step-by-step explanation:

(a) sin 46 = 150 / h where h is the length of the wire.

h = 150/ sin 46

= 208.5 ft.

(b) tan 46 = 150 / x where x is the distance required.

x = 150 / tan 46

x = 144.9 ft.

7 0
3 years ago
Simplify the expression 4x3 2x3
Fittoniya [83]

Answer:

onc

Step-by-step explanation:

3 0
2 years ago
Can someone help me please? :)
Margaret [11]
The answers would be A D and E because if you were to flip them onto each other they would be the exact same
6 0
2 years ago
How do you do these questions?
Tanzania [10]

Answer:

μ ≈ 2.33

σ ≈ 1.25

Step-by-step explanation:

Each person has equal probability of ⅓.

\left[\begin{array}{cc}X&P(X)\\1&\frac{1}{3}\\2&\frac{1}{3}\\4&\frac{1}{3}\end{array}\right]

The mean is the expected value:

μ = E(X) = ∑ X P(X)

μ = (1) (⅓) + (2) (⅓) + (4) (⅓)

μ = ⁷/₃

The standard deviation is:

σ² = ∑ (X−μ)² P(X)

σ² = (1 − ⁷/₃)² (⅓) + (2 − ⁷/₃)² (⅓) + (4 − ⁷/₃)² (⅓)

σ² = ¹⁴/₉

σ ≈ 1.25

3 0
3 years ago
A line passes through (3, 7) and (6, 9). Which equation best represents the line?
lana [24]

Answer:

brainly.com/question/2574086b

Step-by-step explanation:

brainly.com/question/2574086

8 0
3 years ago
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