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alexandr402 [8]
3 years ago
14

A sphere has diameter 28 cm. If the diameter is divided by 2, what is the effect on the surface area?

Mathematics
1 answer:
spayn [35]3 years ago
4 0

Answer:

The surface area is divided by 4.

Step-by-step explanation:

Surface area of a sphere is 4πr².

When the diameter is 28 the radius is 14. So: 4π(14)² = 784π

If you cut the diameter in half you get 14. The radius is now 7.

4π(7)² = 196π.

784/4 = 196 so divided by 4.

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Can somone pls help me plssssss
jeka57 [31]

Answer:

2\frac{2}{5}

Step-by-step explanation:

12 divided by 5= 2.4

OR

2 2/5

Hope this helps! :)

4 0
3 years ago
Read 2 more answers
Solve the following equation.<br> x^2 + 6x − 40 = 0
jonny [76]

Answer:

x = 4 and -10

Step-by-step explanation:

Given the equation

x²+6x-40= 0

The common factors to use for the factorisation are +10 and -4

x²+(10x-4x)-40=0

(x²+10x)-(4x-40) = 0

x(x+10)-4(x+10) = 0

(x-4)(x+10) = 0

x-4 =0 and x+10 = 0

x = 4 and x = -10

8 0
3 years ago
A person's heartbeat is 88 beats per minute. If his/her heart beats 3.1e9 times in a lifetime, how long (in whole years) does th
Anit [1.1K]
We can solve this problem by the rule of three.

88 beats-------------------1 minute
3.1*10⁹ beats------------    x

x=(3.1*10⁹ beats * 1 minute) / 88 beats=35227272.73 minutes.

Now, we express this amount of time in years.

1 year=365 days
365 days=365 day*(24 hour/1day)*(24 hour /1day)*(60 minutes /1hour)=
=525600 minutes.

525600 minutes----------------------1year
35227272.73 minutes----------------x
 
x=(35227272.73 minutes * 1year) / 525600 minutes=67.0229 years
≈ 67 years.

Answer:this person can live 67 years.

5 0
3 years ago
Please help!
Marina86 [1]

Refer to the image attached.

Since, we have to divide the polynomial 4x^2-2x+3 by (x+2) using synthetic division.

We will divide the coefficients  4  -2  3  by -2

First term = 4 will remain same.

Second term = (-2 \times 4) -2 = -8-2 = -10

So, second term = -10

Third term = (-2 \times -10)+3 = 23

So, third term = 23

So, 4   -10   23  is the correct answer

So, Option 2 is the correct answer.

5 0
3 years ago
Identify the common difference or common ratio in the sequence below. 37 , 40 , 43 , 46 , 49 , ...
telo118 [61]
It is 3...
it increases by 3 for example:
37-40 all you gotta do is add 3 to 37 and you get 40!
40-43 add 3 to 40!
43-46 add 3 to 43!
& 46-49 add 3 to 46!

Hope I helped!
4 0
3 years ago
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