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diamong [38]
4 years ago
13

Help me to solve this question plez!!

Mathematics
1 answer:
dimaraw [331]4 years ago
6 0

Let  First Sphere be the Original Sphere

its Radius be : r

We know that Surface Area of the Sphere is : 4π × (radius)²

⇒ Surface Area of the Original Sphere = 4πr²

Given : The Radius of Original Sphere is Doubled

Let the Sphere whose Radius is Doubled be New Sphere

⇒ Surface of the New Sphere = 4π × (2r)² = 4π × 4 × r²

But we know that : 4πr² is the Surface Area of Original Sphere

⇒ Surface of the New Sphere =  4 × Original Sphere

⇒ If the Radius the Sphere is Doubled, the Surface Area would be enlarged by factor : 4

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A plastic bin contains red, yellow, and green key chains. Out of 350 key chains, 10% percent are yellow. Of the remaining key ch
Ulleksa [173]
Hello there! Thank you for asking your question here at Brainly! I will be assisting you with answering this question, and will be teaching you how to handle it on your own in the future.

We have 350 total keychains, in which 10% are yellow, 3/5 are green, and x are red. We will be solving for red, but we need to subtract 10% and 3/5 from 350.

So, let's find out how much 10% of 350 is.
Since 10% is equivalent to 1/10, we can divide 350 by 10 to find how many yellow key chains there are.
350 / 10 = 35.
There are 35 yellow key chains. We can subtract this from 350 to narrow it down.
350 - 35 = 315.

Now, let's find how much 3/5 of 350 is, and subtract it from our new number (315).

Divide 350 by 5, and then multiply that quotient by 3.
350 / 5 = 70.
70 x 3 = 210.

We have 210 green key chains. Now let's subtract that from 315. This will give us the remaining key chains - which are red.
315 - 210 = 105.

There are 105 red key chains.

I hope this helps!
3 0
3 years ago
Evaluate if t=2 and x=3: 3(2x² - £) <br>a.) 102 <br>b.) 30 <br>c.) 48 <br>d.) 12​
AfilCa [17]
C. 48 is the answer for 3(2x^2-£)
3 0
2 years ago
A={2 3 4 5} and B= {6 7 8 9}, what is A B
Dmitry [639]
The answer is AB={12 21 32 45}
8 0
4 years ago
Read 2 more answers
Divide and round to the nearest hundredths place.<br> 2.75 ÷ 6
-BARSIC- [3]
<span>2.75 ÷ 6
= 0.458333
= 0.46 ...r</span><span>ound to the nearest hundredths place

Answer
0.46</span>
3 0
4 years ago
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The average height of a family of five is 150 cm. If the height of 4 family members is 153, 150, 151, and 152, find the height o
Lady bird [3.3K]
J can find the height of the fifth member on this way
S=150
S1=153
S2=150
S3=151
S4=152
S5=?
S= (s1+s2+s3+s4+s5)/5:
5*150= <span>153+150+151+152+S5
S5=5*150-606=750-606=144
Answer is 144 cm</span>
5 0
3 years ago
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