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Annette [7]
2 years ago
9

Find the radius of a sphere with a surface area of $4\pi$ square feet.

Mathematics
1 answer:
nataly862011 [7]2 years ago
6 0

Answer:

r = 1 feet

Step-by-step explanation:

Given that,

The surface area of the sphere, A = 4π feet²

We need to find the radius of the sphere.

The formula for the surface area of the sphere is given by :

A=4\pi r^2

Where

r is the radius of the sphere

Put all the values,

4\pi = 4\pi \times r^2\\\\r=1

So, the radius of the sphere is equal to 1 feet.

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CCSS Math 7
Andre45 [30]

Answer:

1.

a = 112

b = 68

c = 68

2.

a = 127

3.

a=35

b=40

c=35

d=70

4.

a= 30

b=70

c = 30

d=70

e = 130

I'll help you with the rest later

Step-by-step explanation:

a = 112 because of allied angles rule

b and c = 68 because of angles at a point

360-112-112 ÷2

2. a = 127 because of angles on a straight line rule.

180-38-15

3. d= 70, vertically opposite angle

using angles on a straight line, 180 - 70 - 40 ÷ 2

we now have the two angles and because they are vertically opposite a and c = 35

b = 40 because of vertically opposite angles

4. a=30 because 90-70

since a=30, take 90 - 30 to get b, 70

d= 70, vertically opposite angles

e = 130 because a+b+c, vertically opposite angles

7 0
2 years ago
Help now plz it’s due in 8 minutes
Reptile [31]

Answer:

<em>9%</em>

Step-by-step explanation:

Original rectangle: 100 cm by 200 cm

Original area: 100 cm * 200 cm = 20,000 cm^2

Reduced by 70%, the measures are now 30% of they they were.

30% of 100 cm = 30 cm

30% of 200 cm = 60 cm

New area: 30 cm * 60 cm = 1800 cm^3

New area equals what percent of original area?

1800/20,000 * 100 = 9%

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2 years ago
Evaluate the expression for k=6<br> 42/k
Alekssandra [29.7K]
42/6 = 7! Happy to help
5 0
2 years ago
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Slope of y = 5x + 4 ??
Ymorist [56]

Answer:

the slope is m = 5

Step-by-step explanation:

Try using Symbolab, I use it all the time it gives the correct answer and it gives good explanations.

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2 years ago
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Which is the smallest number?
Gekata [30.6K]

Answer:

A is the answer.

Step-by-step explanation:

3.2 x 10-9 = 23.

All the other answers are more than 23.

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2 years ago
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