Question

Find the surface area of an orange with a 2'' radius.

Answer 1

I AM DOING 4 X 22/7 X 4 AND IT KEEPS SHOWING THE WRONG ANSWER

Answer 2

well, what is your final calculated answer?

Answer 3

352/7

Answer 4

SA = 4πr^2
SA = 4(22/7)(2)^2
SA = 4(22/7)(4)
SA = 16(22/7)
SA = 352/7
You just have to plug the numbers into the formula.

Answer 5

WHEN I PUT 352/7 IT IS SAYING ITS THE WRONG ANSWER

Answer 6

Your answer seems correct. some error on their part I guess.

Answer 7

Try putting it in as a decimal? 352/7 ≈ 50.2857

Answer 8

Do you need a more precise value of pi?
Also, are you assuming the orange is perfectly smooth, or do you have to consider the texture?

Answer 9

LET ME TRY 50.2857 AND SEE NOPE ITS SAYING ITS WRONG

Answer 10

Using a more precise value of pi, it is closer to 50.265. Do you know how many decimal digits of precision you need to report, or should you leave it as an exact value (in terms of pi)?

Answer 11

its not telling me

Answer 12

i am also having trouble with this one as well Two concentric spheres have radii of 5" and 6". Find the volume of the space between them.

cubic inches

Answer 13

Take the volume of the bigger one and subtract the volume of the smaller one.
V = 4/3πr^3

Answer 14

4/3 pie 1 = 4/3 right

Answer 15

No. You can't just subtract the radii unfortunately...

Answer 16

Take the volume of the bigger sphere:
V = 4/3πr^3
V = 4/3π(6)^3
V = 288π
Then find the volume of the smaller sphere.
V = 4/3πr^3
V = 4/3π(5)^3
V = 500π/3
Subtract the two volumes to get what we call an annulus.
288π - 500π/3 = 364π/3 or if you want an approximate answer, just use 3.14 or 22/7 for π.
Btw, π is spelled pi not pie lol

Answer 17

lol

Answer 18

Do you get it?

Answer 19

yes thanks my lesson just told me the answer for the previous question it is saying the answer is 16

Answer 20

not sure how they figured that one out.

Answer 21

That means to leave it in terms of pi. The SA=16pi.

Answer 22

That would be the surface area without the π. lol. Probably just a coincidence.

Answer 23

Maybe not.

Answer 24

oh okay i just figured it out wrong

Answer 25

Yeah. Just a clerical error.