# Your classmate claims that if you double the radius of a sphere, its surface area and volume will quadruple. What is your classmate’s error? Explain.

QUESTION POSTED AT 03/12/2019 - 04:21 AM

QUESTION POSTED AT 03/12/2019 - 04:21 AM

SA of a sphere is 4πr² Using a sample of radius 3 the SA would be 36π²

(4πx3²) If we double the radius and make it 6, the SA would be 144π²

So for Surface area, your classmate is correct.

What about the volume? V of a Sphere = 4/3 π r³

Again using 3 the Volume of a Sphere with radius 3 = 4/3 π 27

But the volume of a sphere with radius 6 = 4/3 π 216 which is eight times the volume of the smaller sphere. (27 x 8 =216) So your friend is right about Surface Area but wrong about the volume.

(4πx3²) If we double the radius and make it 6, the SA would be 144π²

So for Surface area, your classmate is correct.

What about the volume? V of a Sphere = 4/3 π r³

Again using 3 the Volume of a Sphere with radius 3 = 4/3 π 27

But the volume of a sphere with radius 6 = 4/3 π 216 which is eight times the volume of the smaller sphere. (27 x 8 =216) So your friend is right about Surface Area but wrong about the volume.

I think the answer to that is 8 because i added 9+6=15 then I added 4+3=7 and then I subtracted 15-7=8 just check your answer if I'm correct or not

ANSWERED AT 09/12/2019 - 05:06 AM

QUESTION POSTED AT 09/12/2019 - 05:06 AM

I agree. would take the 3 dresses and multiply 5 yards a piece. So she needs a total of 15 yards estimating.

ANSWERED AT 09/12/2019 - 05:06 AM

QUESTION POSTED AT 09/12/2019 - 05:06 AM

So multiply 1/4 by 10 and get 10/4=8/4+2/4=2+1/2=2 and 1/2

is 2 and 3/8 more or equal to than 2 and 1/2

1/2 times 4/4=4/8

he needs 2 and 4/8 and has 2 and 3/8, he is short 1/8 lb

he does not have enough

is 2 and 3/8 more or equal to than 2 and 1/2

1/2 times 4/4=4/8

he needs 2 and 4/8 and has 2 and 3/8, he is short 1/8 lb

he does not have enough

ANSWERED AT 09/12/2019 - 04:59 AM

QUESTION POSTED AT 09/12/2019 - 04:59 AM

Knowing 1+7 helps you find the sum of 7+1 because 1+7 and 7+1 is communitive property of addition. Also because 1+7 is the same answer as 7+1.

Ex:

1+7=8

And

7+1=8

its the same result.

Ex:

1+7=8

And

7+1=8

its the same result.

ANSWERED AT 09/12/2019 - 04:58 AM

QUESTION POSTED AT 09/12/2019 - 04:58 AM

1. To do this, you want to divide 1560 by 24. This gives you 65. The bottle fills 65 bottles per hour.

2. To do this divide 4290 by 78. The result is 55. It would take the groundskeeper 55 hours to drain the pond.

3. They are similar because you break up pieces of the number and then you combine them.

2. To do this divide 4290 by 78. The result is 55. It would take the groundskeeper 55 hours to drain the pond.

3. They are similar because you break up pieces of the number and then you combine them.

ANSWERED AT 09/12/2019 - 04:53 AM

QUESTION POSTED AT 09/12/2019 - 04:53 AM

If you multiply length times width to get area, it's the same with division. You do area divided by length or width. The equation would be 225 divided by 13 3/4. 225/13 3/4= 16.36 inches. 16.36 > 16 inches, so the answer would be no. (The mirrors length and width are 13 3/4 inches by 16 9/25)

ANSWERED AT 09/12/2019 - 04:53 AM

QUESTION POSTED AT 09/12/2019 - 04:53 AM

To find out how much they earned, we need to find the GCF of 184 and 207.

The greatest common factor (GCF) of 184 and 207 is**23**.

That means they earn 23 dollars per day. That is your answer for part b.

And Thomas worked 184/23 =**8 days**

While Sharlina worked 207/23 =**9 days**

That is your answer for part a.

The greatest common factor (GCF) of 184 and 207 is

That means they earn 23 dollars per day. That is your answer for part b.

And Thomas worked 184/23 =

While Sharlina worked 207/23 =

That is your answer for part a.

ANSWERED AT 09/12/2019 - 04:51 AM

QUESTION POSTED AT 09/12/2019 - 04:51 AM

4(754)

=4(700+50+4)

=2800 + 200 + 16

=3000+16

=3016

-----------------

4(754)

=4(250+250+250+4)

=1000+1000+1000+16

=3016

ANSWERED AT 09/12/2019 - 04:51 AM

QUESTION POSTED AT 09/12/2019 - 04:51 AM

The answer to that question is 48. All you do is muliply 4*1.5*8=48

ANSWERED AT 09/12/2019 - 04:42 AM

QUESTION POSTED AT 09/12/2019 - 04:42 AM

1/7 = 0.142857142857142857142857142857142857142857142857142857 and so on

the pattern repeats

the first digit is 1

second digit is 4

third digit is 2

fourth digit is 8

fifth digit is 5

sixth digit is 7

and then the seventh digit is 1, and it repeats

so the six digits repeat again and again...

2012/6 = 335 2/6

It has a remainder of 2, which means that the 12th digit will be**4**. because that is the second digit. After going 335 times the 6 digit patterns it will stop at the second digit which is 4.

Your answer is**4**.

I hope you understood, it was kind of hard to explain :P

the pattern repeats

the first digit is 1

second digit is 4

third digit is 2

fourth digit is 8

fifth digit is 5

sixth digit is 7

and then the seventh digit is 1, and it repeats

so the six digits repeat again and again...

2012/6 = 335 2/6

It has a remainder of 2, which means that the 12th digit will be

Your answer is

I hope you understood, it was kind of hard to explain :P

ANSWERED AT 09/12/2019 - 04:37 AM

QUESTION POSTED AT 09/12/2019 - 04:37 AM

-3 + -4 = -7

add the numbers and keep the common sign.

-3 * -4 = 12

since the factors are both negative, the product is positive, when multiplying and/or dividing.

add the numbers and keep the common sign.

-3 * -4 = 12

since the factors are both negative, the product is positive, when multiplying and/or dividing.

ANSWERED AT 09/12/2019 - 04:26 AM

QUESTION POSTED AT 09/12/2019 - 04:26 AM

One way: subtract 12-3 =9

the other way sub in and make equations

the other way sub in and make equations

ANSWERED AT 09/12/2019 - 04:25 AM

QUESTION POSTED AT 09/12/2019 - 04:25 AM

Rewrite in slope intercept from y=mx+b y=1-3x+11/3

ANSWERED AT 09/12/2019 - 04:22 AM

QUESTION POSTED AT 09/12/2019 - 04:22 AM

This might help you out...

ANSWERED AT 09/12/2019 - 03:58 AM

QUESTION POSTED AT 09/12/2019 - 03:58 AM

Three At the same time and 1picked y or g and two picked red or b

ANSWERED AT 09/12/2019 - 03:57 AM

QUESTION POSTED AT 09/12/2019 - 03:57 AM

he has 188 bucks and 5 friends plus him each cost 19 bucks so divided 19 and 188 equal answer th em divided the answer and 5

ANSWERED AT 09/12/2019 - 03:53 AM

QUESTION POSTED AT 09/12/2019 - 03:53 AM

A. 24 + X

B. 24 + X = 36

C. 36 - 24 = X

B. 24 + X = 36

C. 36 - 24 = X

ANSWERED AT 09/12/2019 - 02:41 AM

QUESTION POSTED AT 09/12/2019 - 02:41 AM

284.13 grams

because you do 4.51 x 21 , then you have to multiply by 3

because you do 4.51 x 21 , then you have to multiply by 3

ANSWERED AT 09/12/2019 - 01:28 AM

QUESTION POSTED AT 09/12/2019 - 01:28 AM

OK 2+2+2+2+2+2+2=14 and it's the same as 2×7

ANSWERED AT 08/12/2019 - 10:45 PM

QUESTION POSTED AT 08/12/2019 - 10:45 PM

The answer of 941 ÷2 is 470.5

ANSWERED AT 08/12/2019 - 04:57 PM

QUESTION POSTED AT 08/12/2019 - 04:57 PM

**Answer:**

**Step-by-step explanation:**

The area of a rectangular picture frame is 30 1/3 square inches. The length of the frame is 6 1/2.

Area of rectangle = length x width

We have

ANSWERED AT 08/12/2019 - 04:39 PM

QUESTION POSTED AT 08/12/2019 - 04:39 PM

Julie reads that 1 pint is
equivalent to 0.472 liters.

First, he asked his teacher how many liters are there in 1 pint and answered 0.47 liters

Then he asked his parents and said 0.5 liters.

They are both correct, why?

becayse the exact value if 0.473 when you round this to its nearest hundredths, the answer would be 0.47 and when you round it to its nearest tenths, the answer will be 0.5. Thus both answers are correct.

First, he asked his teacher how many liters are there in 1 pint and answered 0.47 liters

Then he asked his parents and said 0.5 liters.

They are both correct, why?

becayse the exact value if 0.473 when you round this to its nearest hundredths, the answer would be 0.47 and when you round it to its nearest tenths, the answer will be 0.5. Thus both answers are correct.

ANSWERED AT 08/12/2019 - 04:37 PM

QUESTION POSTED AT 08/12/2019 - 04:37 PM

Yes, because the painter painted half a room in half a day and if he were to paint the other half in the other half of the day it would give you one room painted in one whole day.

ANSWERED AT 08/12/2019 - 04:29 PM

QUESTION POSTED AT 08/12/2019 - 04:29 PM

15(90-3)

=15(10*9-3)

=15*10*9-15*3

=150*9-45

=1,350-45

=1,305

-----------------

15(90-3)

=15(87)

=15(80+7)

=15(10*8+7)

=15*10*8+15*7

=150*8+(10+5)*7

=1,200+70+35

=1,200+105

=1,305

ANSWERED AT 08/12/2019 - 04:27 PM

QUESTION POSTED AT 08/12/2019 - 04:27 PM

No because no matter what u multiply 7:5 u will never get 35:10, they are not equal

ANSWERED AT 08/12/2019 - 04:22 PM

QUESTION POSTED AT 08/12/2019 - 04:22 PM

U just find the factors of 104 which are 2, 2, 2 and 13. Then combine them in any way to make 2 numbers

like 2 times 2 times 2 and 13

which would be 8 times 13

like 2 times 2 times 2 and 13

which would be 8 times 13

ANSWERED AT 08/12/2019 - 04:17 PM

QUESTION POSTED AT 08/12/2019 - 04:17 PM

Each straw is 4-1/8 inches long.

You have one gigantic piece of straw material, 123-3/4 inches long.

How many straws can you cut it up to make ?

===> (123-3/4) divided by (4-1/8) straws.

Each one costs $0.015 to make.

So, once you find the number of short straws you have,

multiply

===> (the number of short straws) x ($0.015) .

That'll tell you how much it costs to make all of them.

Now you know how to do it on your own.

If you don't get 30 straws and $0.45 , please try again.

ANSWERED AT 08/12/2019 - 04:01 PM

QUESTION POSTED AT 08/12/2019 - 04:01 PM

fluid ounces

First, we are going to find the total amount of shampoo he used. We know from a our problem that he uses of the shampoo every time he washes his hair and he washed his hair 6 times, so we just need to multiply the number of times (6) by the amount used every time () to find how much shampoo he used:

We know that he used of the bottle of shampoo. Since the bottle of shampoo held 10.5 fluid ounces, we are going to multiply 10.5 fluid ounces by to find how much fluid ounces he used:

Now, to find the ounces of shampoo left, we just need to subtract the ounces used (3.9375 fluid ounces) by the initial fluid ounces in the bottle of shampoo (10.5 fluid ounces):

or expressed as a mixed fraction:

**We can conclude that there are** **fluid ounces of shampoo left after Tomas washed his hair 6 times.**

ANSWERED AT 08/12/2019 - 04:01 PM

QUESTION POSTED AT 08/12/2019 - 04:01 PM

1) Striangle = 24*24 = 576 mm^2

2) Ssqare = 12*12 = 144 mm^2

3) Sfigure = 576 - 144 = 432 mm^2

Number C

ANSWERED AT 08/12/2019 - 03:53 PM

QUESTION POSTED AT 08/12/2019 - 03:53 PM

1) Striangle = 1/2 * (12-8) * 4 = 1/2 * 4 * 4 = 8 km^2

2) Srectangle = 4 * 8 = 32 km^2

3) Sfigure = 8 + 32 = 40 km^2

Number C

ANSWERED AT 08/12/2019 - 03:53 PM

QUESTION POSTED AT 08/12/2019 - 03:53 PM