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3 years ago

What is the surface area of a sphere with a radius of 20 m?

Mathematics

2 answers:

navik [9.2K]3 years ago

8 0

SA=4pir^2
r=20m
SA=4pi20^2
SA=4pi400
SA=1600pi m^2

RideAnS [48]3 years ago

6 0

The formula of surface area of sphere= 4pi*r^2
radius=20 m
S.A=4*pi*20^2
S.A=4*pi*400
S.A=1600 pi m2
so the answer is a 1600 pi m2

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The weight of an object rounds to 41.3 kilograms select the three posible weights that correctly round to 41.3 kilograms

nekit [7.7K]

Answer:

See Explanation

Step-by-step explanation:

Given

$Weight = 41.3kg$

Required

Determine the weights that approximates to 41.3kg

The options are not given but the question is still solvable

In approximation:

0 - 4 approximates to 0

This implies that:

41.30 to 41.34 approximates to 41.3

Also:

5 - 9 approximates to 1

This implies that:

41.25 to 41.29 approximates to 41.3

Bring the range together, we have:

$Range = 41.25\ to\ 41.34$

Select any three numbers within this range, and you have your answer

Examples are: 41.25, 41.28, 41.34\

4 0

3 years ago

Please help the last question of the day! For brainliest

Semenov [28]

Answer:

2\10

Step-by-step explanation:

1\2 = 5\10

7\10 - 2\10 = 5\10

8 0

3 years ago

Find the a26 arithmetic sequence: -15,-35,-55,-75 -515 460 -490

Vlad [161]

Step-by-step explanation:

<h3>QUESTION:-</h3>

Find 26th term of the A.P --15,-35,-55,-75...

<h3>Solution:-</h3>

First term=a=-15

Common Difference=d=-20

We know that

$\boxed{\sf a_n=a+(n-1)d}$

$\\ \:\:\:\:\sf {:}\dashrightarrow a_{26}=-15+(26-1)(-20)$

$\\ \:\:\:\:\sf {:}\dashrightarrow a_{26}=-15+25(-20)$

$\\ \:\:\:\:\sf {:}\dashrightarrow a_{26}=-15+(-500)$

$\\ \:\:\:\:\sf {:}\dashrightarrow a_{26}=-15-500$

$\\ \:\:\:\:\sf {:}\dashrightarrow {\boxed{\bf a_{26}=-515}}$

6 0

3 years ago

The length of bills backyard swimming pool is 60 feet longer than the width of the pool. The surface area of the water is 1600 s

shutvik [7]

Answer:

The width is 20 ft and the length is 80 ft

Step-by-step explanation:

Area = l * w

l = w +60

SA = 1600 ft^2 ( which is the regular area) The surface area of the water is just what is on top which is length times width

1600 = l*w

Substitute in l = w+60

1600 = (w+60) *w

Distribute the w

1600 = w^2 +60w

Subtract 1600 from each side

1600-1600 = w^2 + 60w -1600

0 = w^2 + 60w -1600

Factor

0=(w-20) (w+80)

Using the zero product property

w-20=0 w+80 =0

w=20 or w=-80

The width cannot be negative so

w=20

Now we need to find the length

l = w+60

l = 60+20

l =80

7 0

3 years ago

If 48 feet are represented by 12 inches on a scale drawing, then a scale of 1/4 inch represents how many feet? a. 3 foot c. 2 fo

alukav5142 [94]

Hello there!

Math is hard! So we as students, we need to play the smart game with Math in order to find the easiest way to solve the problems. What do I mean? Well as you can see they gave us Fraction which won't be easy! So we will transform the fractions into decimals. So let's get started.

Then a scale of 1/4. Transformed into decimal = Then a scale of 0.25
So instead of using the fraction 1/4, I used its decimal 0.25

So if:

48 feet ......> 12 inches
x feet ........> 0.25 inches

Cross multiply

12 * x = 0.25 * 48

12x = 12
Divide both sides by 12
12x/12 = 12/12

x = 1

The correct answer is option D, 1 foot

I hope this helps! Please let me know if you have any question.

Thanks!

5 0

3 years ago