Question

If the smaller sphere has a surface area of 452.16 in2, what is the surface area of the larger sphere?

Answer 1

\[\frac{ A _{1} }{ A _{2} } = \left(\begin{matrix}\frac{ r _{1} }{ r _{2} } \\ \end{matrix}\right)^{2}\]

Answer 2

you can plug in the values to get the answer.

Answer 3

um im kind of confused plug what number in?

Answer 4

well u have r1 and r2..
it is the radius of smaller and larger sphere..
and u have A1 which is area of smaller sphere...
A2 is the area for larger one..

Answer 5

im sorry what is my r1? is my r1=1 and my r2=2?

Answer 6

its the radius of your sphere.. if you look at the diagram u posted u will see it has mentioned the radius of each sphere.

Answer 7

ahhh i seriously dont see it i see 2r and r?

Answer 8

yes well that is the radius.. r =r1, 2r =r2

Answer 9

oh lol thats what i asked. but for the a1 and a2 dont i substitute it with a numbeR? if so what would that number be because i dont see it

Answer 10

you have number for a1.. lol the area u mentioned in the question.. u replace it with that and u have to find a2

Answer 11

ohhhhhh okay so would it be 452.16/a^2=1/2?

Answer 12

probably (1/2)^2

Answer 13

ok i think i got 1,808.64 in^2 is that right?

Answer 14

yes

Answer 15

oh okay thank you soo muchhh

Answer 16

do you have time to help me with a few more?

Answer 17

sure..

Answer 18

as long as i can keep my eyes open :P

Answer 19

lol okay dont fall asleep on me

Answer 20

At his trucking company, Alfred received an order to ship 153 cubic feet of oil in cylindrical steel barrels. If each barrel has a radius of 1.1 feet and is 3 feet tall, how many steel barrels will Alfred need?

Answer 21

ok i hope i won't :P
well u have to findthe volume of cylinder first..
vol = pi *r^2*h.. i think it is the formula.. tell me what u get.

Answer 22

incase i don't reply back tag me up have alot of tab opens here.

Answer 23

okay thank you

Answer 24

umm thats it?

Answer 25

well i got 11.3 is that right?

Answer 26

@nubeer well i got 11.3 is that right?

Answer 27

yes this much fuel one tank can contain and u got an order of 153
so 153 /11.3

Answer 28

and i think it's 11.4 if not wrong.

Answer 29

ohh, okay i see where i made my mistake so do i round that?

Answer 30

well i got 11.39 so ya u can keep like that or round it up.

Answer 31

but i see answer choices
A 13
B. 15
C. 14
D. 12

Answer 32

i know.. did u do 153/11.4?

Answer 33

i got 13.4 then so that rounds to 13 so its A?

Answer 34

yes.

Answer 35

oh okay. i have another question

Answer 36

The measure of PQR is 60°. The length of radius QR is 7 inches. What is the area of sector PQR? (Use 3.14 for .)

Answer 37

hmm i hope u know how to change angle in radians..
Area = 0.5*r^2* theta.

Answer 38

ehhh i actually dont...can you show me one example and i should get it

Answer 39

hmm..
lol if they havent taught u so why u have to do the question..
if u have to convert degree into radian
angle * pi/180

Answer 40

well they taught me im just not 100 percent positive i understand it completely

Answer 41

well do u get it now/

Answer 42

i got 3.67 as my answer is that right?

Answer 43

no.. how did u get that?

Answer 44

ohh wait i didnt convert it sorry i mean 25.64

Answer 45

yes.

Answer 46

okay thank you i think im getting the hang of this now :)

Answer 47

i am glad to hear it .. :)

Answer 48

lol i have more do you mind?

Answer 49

nah i don't . well how many more u have?

Answer 50

lol i have like 25 more practice problems

Answer 51

lol thats more like a complete assignment.. O.o

Answer 52

lol kinda but its just like problems i have to do not really for a grade or anything

Answer 53

lol.. ok i will help as long as u can lol if u promise to write a testimonial for me :P

Answer 54

lollll off course :D

Answer 55

lol sweet..

Answer 56

but don't mind if i fall asleep.. :P

Answer 57

A circle has a radius of 16 centimeters. If 5/6 of the circle is cut away, what is the area of the remaining portion?
(Use 3.14 for .)

Answer 58

i won't :) i know your probably tired

Answer 59

area of circle = pi * r^2
to find the remaining = 1/6 * area.

Answer 60

but lol u have to keep up the pace with me.. :P

Answer 61

seems like u have fall asleep on me. :P

Answer 62

ok i got 133.9

Answer 63

sorrryy lol im trying

Answer 64

ya 134..

Answer 65

yes ok i got that one

Answer 66

The circle above has an area of 196 cm2. What is the area of the blue sector? (Use 3.14 for .)

Answer 67

(120/360)*196

Answer 68

ok got that thanks youu

Answer 69

If the height of the base is 23 inches and the radius is 5 inches, what is the approximate volume of the trash can?

Answer 70

pi* r^2 * 23

Answer 71

and why i can't see u online.. :(

Answer 72

i got 1805.05 is that right? because i dont see that as an answer

Answer 73

what do you mean?

Answer 74

what are ur options?

Answer 75

A 2,199 in3
B. 754 in3
C. 2,068 in3
D. 2,330 in3

Answer 76

i mean u know OS shows the people who are online from your fans..

Answer 77

do u have a figure for it..

Answer 78

yeah

Answer 79

umm idk i became your fan though

Answer 80

ok makes sense.. u have to add the volume of that half sphere too..
vol of sphere= 4/3 * pi * r^3

Answer 81

it would be D option..

Answer 82

oh okay because i was getting something else

Answer 83

lol.. what u got tell me.

Answer 84

i got 523 lol

Answer 85

yes lol now divide it by 2.. and add it to the volume of cylinder u found earlier.. will make C option

Answer 86

oh okay i see

Answer 87

yees

Answer 88

Robert's parents recently built a rectangular swimming pool that measures 4 meters long, 4 meters wide, and 2 meters deep. If the pool is 85% full, how much more water is needed to finish filling the swimming pool?

Answer 89

4.8 m^3

Answer 90

lol what are u

Answer 91

lol sleepy guy :P

Answer 92

your smart :0

Answer 93

If b = 2 cm, h1 = 5 cm, and h2 = 15 cm, what is the volume of the prism?