Mathematics High School

the radius of a sphere is 21cm find its area and volume​

Answers

Answer 1

Answer:

5544cm (squared)

Step-by-step explanation:

Surface area of a sphere=4πr  (squared) =4×  7/ 22 ×21×21cm  (squared)  

 

Surface area of the sphere=5544cm  

.

Answer 2

Answer:

Area = 5164.8 cm; volume = 38792.4 centimeters

Step-by-step explanation:

Since the radius is known, we can substitute it for r in the first formula.

A = 4πr²

A = 4π(21)²

A = 4π(411)

A = 12.566370614359 * 411

A = 5164.8

V = 4/3πr^3

V = 4/3π21^3

V = 4/3π(9261)

V = 4.1887902047863 * 9261

V - 38792.4

Related Questions

HELP HELP DUE in 11 ahahhajs

Answers

Answer:

1st one: 270 ft ^2

2nd: 30 square yards

Step-by-step explanation:

The first one you have to find the area. 15×18= 270

The second one you take the previous answer and divide by 9= 30 square yard. (Might be wrong?)

HELPPP (hopefully this on works)

Answers

Answer:

marla is 180m from the info center and she walked 240m from the parking lot to the lake

Helpppp meee pleaseee

Answers

B= the square root of 65

Formula: a^2= c*2-b^2

a^2= 81-16= 65

Once you find the square root of 65, thats your answer, but here they want you to keep it as 65.

Hope this helps!

what is 6 root 2 divided by 2 simplified to​

Answers

Answer:

Exact Form:

3

√

2

3

2

Decimal Form:

4.24264068

Step-by-step explanation:

PLEASE HELPPP!!! I will mark you the BRAINLIEST

Answers

It’s blurry so I csnt see it
Sale price = 1.799 * 15/100 (number 4)

math work pls help :)​

Answers

Answer:

the theorum used here is sas one

Solving systems of equations using substitution. y=2x+8. y=5-x

Answers

Answer:

(x, y) = (-1, 6)

Step-by-step explanation:

y = 2x + 8

y = 5 - x

Substituting the second equation into the first equation, we get:

5 - x = 2x + 8

5 = 3x + 8

-3 = 3x

x = -1.

So, y = 5 - (-1).

Simplifying, we get:

y = 6.


Find the value of x. Round your answer to the nearest tenth.
Help please!

Answers

Use the formula c^2 = a^2 + b^2
9^2 = x^2 + 7^2
81 = x^2 + 49
x^2 = 32
x = 5.7 (rounded)

When people are discharged from a hospital, they are surveyed about the quality of their stay. The hospital asks each person to turn in the survey before leaving. Is this a simple random sample?

Yes, because each person has the opportunity to respond to the survey.

Yes, because each person is equally likely to get the survey.

No, because not everyone has the same opportunity to answer the survey.

No, because each person is asked to fill out the survey, so this is not a sample.

Answers

Answer:

No, because not everyone has the same opportunity to answer.

Step-by-step explanation:

Answer:

C is the correct answer

Step-by-step explanation:

I just took the quiz on edge 2023

1) You can spend at most $24 at the fair. Game

tickets cost $2 each, and ride tickets cost $4

each. You want to buy at least 3 game tickets

and more than 2 ride tickets. Write a system

of linear inequalities that represents the

situation. How many of each ticket can you

buy?

Answers

Answer:

2x+4y= 24

x≥3

y≤2

Step-by-step explanation:

Given data

total expenses= $24

let the number of tickets be x

and the number of rides be y

Tickets cost $2 each, and ride tickets cost $4

Hence the expression for the situation is given as

2x+4y= 24

x≥3

y≤2

What’s the answer help pls

Answers

Answer:

7,715

Step-by-step explanation:

that the answer

if pick I pick the first one

Answer:

total cost 4125+3600 = 7725

2nd  275n + 300n

Step-by-step explanation:

(275*15) + (12*300)

How do you know to add for the first one and multiply for the second??

Answers

Answer:

When you multiply the variables with different exponents, you add. When you multiply an exponent with another exponent, you multiply.

Step-by-step explanation:

Answer above

if x stands for am number what is the mathematical phrase that represents three more than the number​

Answers

I think it’s just

x (times) 3

Could someone please help me with these two???

Answers

1. 3 Side-Side-Angle can not prove congruence
2. 1 Angle- Angle-Angle can not prove congruence

6(X - 2) = -48

Find x

Answers

Answer:

6x-12=-48

6x=-36

x=-6

Step-by-step explanation:

6(X - 2) = -48

6X - 12 = -48

6X = -48 + 12

6X = -36

6X/6 = -36/6

X = -6

Greatest Value Emer your answer then press "S 5 + 7.6​

Answers

Answer:

5s+7.6 is already simplified

Step-by-step explanation:

Hope I answered your question correctly:)

9 g = 207
g=___? Helppp!

Answers

Answer:

g = 23

Step-by-step explanation:

Divide 207 / 9 = 23

Answer:

G=120

Step-by-step explanation:

Mahra has 3 adults and 2 children coming over. She is going to serve 2 small apple pies. If she plans to give each person, including herself, an equal amount of pie. How much pie will each person get?

Answers

Answer:

1/3 pies per person

Step-by-step explanation:

there are 6 people who gets served.

2 pies / 6 people = 1/3 pies per person

Answer:

2/6 = 1/3

She has 5 visitors + herself=6

Six people share 2 pies

She'll have to cut each pie into 3 equal pieces

So everyone will get a third of an apple

That is 1/3

HELP ILL MARK YOU BRAINLIST

Answers

Answer:

slope is 3/5

y intercept (0,0)

Step-by-step explanation:

2. What is the slope of a line that is parallel to the line shown?
A) 3/2
B)-2/3
C) -3/2
D)2/3​

Answers

I think it’s B
Sorry if it’s wrong...

I need help with this ?

Answers

Answer:

8(3y + 2) = 8 * 3y + 8 * 2 = 24y + 16

Step-by-step explanation:

The outer rectangle has width 8 and length 3y + 2.

The area of the outer rectangle is length times width or width times length, so the area is 8(3y + 2).

We can also find the area by finding the area of each small rectangle, and adding the areas together.

The left small rectangle has dimensions 8 and 3y.

A1 = WL = 8 * 3y = 24y

The right small rectangle has dimensions 8 and 2.

A2 = WL = 8 * 2 = 16

The total area of both small rectangles is 24y + 16

That tells use that

8(3y + 2) = 8 * 3y + 8 * 2 = 24y + 16

This is the distributive property at work.

Area of rectangle: length x width

Length: (3y + 2)
Width: 8

Area:
= (3y+2) x 8
= 8(3y) + 8(2)
= 24y + 16

The answer is 24y + 16.

Moussa's family took a road trip to the Grand Canyon. Moussa fell asleep after they
had travelled 434 miles. If the total length of the trip was 700 miles, what percentage
of the total trip had they travelled when Moussa fell asleep?

Answers

Answer:

38%

Step-by-step explanation:

So first you need to find what 434/700 is because that is when she fell asleep. Divide each side by 2 to get 217/350. Use division to find the decimal. Once you are done with that, you get 0.62. You then subtract 0.62 from 1 because that is the amount of when she fell asleep. 1-0.62=0.38. 0.38 is also 38% so Moussa fell asleep for 38% of the trip.

Hopefully this helps you

What is wrong with the equation below?
|x|= -3

Answers

Answer:

In mathematics, the absolute value or modulus of a real number x, denoted |x|, is the non-negative value of x without regard to its sign.

What’s the rate of -5x - 6

Answers

Answer:

30

Step-by-step explanation:

Pls help me urgent pls

Answers

Answer:

You can use distance formula,

i. e. underroot (x sub2 - x sub1 )^ 2 - (y sub2 - y sub1 )

where u take first point as x sub1 and x sub2

and,

take second point as y sub1 and y sub2

where,

sub = subscript

Try for urselves and let me know

Hope it helps

Hope it helps ALL THE BEST !!


A line passes through (-3, -1) and is parallel to the graph of y = 3x-4 has a slope Please help

Answers

Answer:

-12

Step-by-step explanation:

POINTS POINTS PLEASE HELP POUNTS WILL BE GIVEN

Answers

Answer:

option 3  / hope this helps

Step-by-step explanation:

i did this test a while ago so if its wrong im sorry

Answer:

[tex] m\angle A = 40\degree[/tex]

Step-by-step explanation:

[tex]m\angle A = \frac{1}{2} (115 \degree - 35 \degree) \\ \\ m\angle A = \frac{1}{2} \times 80\degree \\ \\ m\angle A = 40\degree \\ \\ [/tex]

Please help with this! The problem I need help with is problem 7.

Answers

Step-by-step explanation:

Cost per box : $1.2

[tex] \frac{1.5}{12} \times 100\% = 12.5\%[/tex]

Which statement is not true

Answers

Answer:

a that corresponds to y is wrong

Please help with math

Answers

Answer:

sin x= opp/hyp

sin x=18/30

sin x =3/5

cos x= adj/hyp

cos x=24/30

cos x=4/5

tan x=opp/adj

tan x=18/24

tan x=3/4

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