Question

im gunna insert the pic

Answer 1

im gunna help

Answer 2

can u turn it around again

Answer 3

ill take a better one

Answer 4

omg you did the thing again ivy pls

Answer 5

which problem are we doing so I can just type it out

Answer 6

uhm 18, 19, 20

Answer 7

ill type it

Answer 8

I can type faster watch

Answer 9

kk lol

Answer 10

If a spherical baseball has a diameter of 7 cm calcualte the surface area of the ball
12.25 \(\pi cm^2\)
49 \(\pi cm^2\)
42.875 \(\pi cm^2\)
57.167\(\pi cm^2\)

Answer 11

woah u type fast

Answer 12

if a spherical basball has a diameter of7 cm,, calculate the volume

if a spherical bubble has a volume of 36 pi cm^3 calculate the surface area of the bubble

Answer 13

we'll start with 18. what's the formula for the SA of a sphere?

Answer 14

uhmA=4πr2

Answer 15

yeah, google says A=4πr2

What is the radius of a sphere with a 7 cm diameter?

Answer 16

idk

Answer 17

kinda/;

Answer 18

the radius is half the diameter. don't be vague, I have no problem explaining every little thing :)

Answer 19

3.5

Answer 20

correct. so now we have r = 3.5
and A=4πr2

Answer 21

thank you

Answer 22

yes

Answer 23

plug in the stuff and do the stuff

Answer 24

153.94

Answer 25

notice the answer choices, you don't have to multiply by pi

Answer 26

ohhh.. let me redo that then

Answer 27

196

Answer 28

do we not multiply by 4 too?

Answer 29

we do. what we want is A=4πr2
4*3.5^2=4*3.5*3.5

Answer 30

49?

Answer 31

49*pi

Answer 32

153.96

Answer 33

but they don't have that^ as a choice

Answer 34

ivy pls

Answer 35

?

Answer 36

look at the answer choices. they're all listened in terms of pi

Answer 37

ohhhhhh

Answer 38

i get it

Answer 39

yeah lol, so 49pi is our answer. same thing happens with the next 2 questions. try 19 yourself. I'll watch

Answer 40

thank you omg is so fureakin easy then

Answer 41

duh it's high school math

Answer 42

jk

Answer 43

would 19 be d

Answer 44

lol

Answer 45

but i don't get 20

Answer 46

\(\huge \frac{4}{3} \pi r^3 = \frac{4}{3} \pi 3.5^3 = 42.875*\frac{4}{3} \pi = 57.16 \pi\)

Answer 47

you did it, lemme read 20

Answer 48

kk thank you so much(:

Answer 49

ok so we have \(\huge V=\frac{4}{3} \pi r^3 = 36 \pi cm^3\)
we just have to work backwards

Answer 50

ohhh

Answer 51

\(\huge \frac{3}{4}*\frac{4}{3} \pi r^3 = \frac{3}{4}*36 \pi cm^3\)
\(\huge\pi r^3 = 27 \pi cm^3\)

Answer 52

well\[\huge \cancel {\frac{3}{4}}*\cancel{\frac{4}{3}} \cancel{\pi} r^3 = \frac{3}{\cancel{4}}*\cancel {36} 9 \cancel{\pi} cm^3\]

Answer 53

and so we're left with r^3 = 27 cm^3

Answer 54

so it would be 27?

Answer 55

kinda confused

Answer 56

We're trying to find the surface area of a sphere.

The information we have is the volume. We have to work backwards from the volume formula to get the radius. Then we use the radius to find the S.A.

Answer 57

we got 27 as the radius ?

Answer 58

no. we have \[\large r^3 = 27cm^3\]\[\large r = ?cm\]

Answer 59

9

Answer 60

in algebra, to get rid of something you use an inverse operation. here the inverse of something cubed, is taking the cubed root so:\[\huge \sqrt[\cancel3]{r^\cancel{3}} = \sqrt[3]{27cm^3} \]

Answer 61

idk how to take a cubed square root yet

Answer 62

I don't know how to do it either. my calculator says 3

Answer 63

oh kk 3 then

Answer 64

it would be 36

Answer 65

r=3
SA of a sphere: A=4πr2

What is the SA of the bubble?

Answer 66

pi

Answer 67

yusss

Answer 68

than youuu so much legit

Answer 69

no probs

Answer 70

huh?

Answer 71

never mind, wrong question

Answer 72

lolllllll

Answer 73

hum can u help me w 2 more ?

Answer 74

if u have time ?

Answer 75

lol sure. I'm on 2 questions so I'm like really distracted but sure