Question

Just want to check my answers in prep for a math test. Any help will be appreciated. Medal will be given out.

Answer 1

For the first question, I got: 6.28ft^3.

Answer 2

Second question: 51918mm^3

Answer 3

Third: 22cm^3
Fourth: 10in
Fifth: 15m
Sixth: 3.3yd
Seventh: 76.8in^3
Eighth: 8514.8in^3
Ninth: 3250.8cm^3
Tenth: 101.2gallons
Eleventh: Max: 203470in^3 Min: 12715ft^3
Twelfth: a) 2:1 b) 4:1
Thirteenth: 254.2in^3

Answer 4

Cylinder Volume = PI*r^2*height
Cylinder Volume = PI*2*2*2
Cylinder Volume = 25.1327412287

So your first answer is incorrect

Answer 5

Yes thank you for that

Answer 6

I'm guessing for "2" it is finding the volume of a cylinder?

Answer 7

Yes

Answer 8

#2 I get 51,941.84
Which is close to what you calculated

Answer 9

How did you get that answer?

Answer 10

Volume = PI*radius * radius * height
Volume = PI* 16.6*16.6*60

Answer 11

The radius is = 16.6
16.6^2 times 3.14 = 865.3mm^2

865.3mm times 60 = 51918

Answer 12

But for PI I used the more exact figure of 3.14159265358

Answer 13

@jim_thompson5910

Answer 14

Okay I got that.

Answer 15

Well I checked 2 answers for you. Maybe you can get some other folks to check the others.

Answer 16

Yes @jim_thompson5910 is here. Thank you.

Answer 17

#3 is asking for total volume?

Answer 18

yes

Answer 19

I'm getting 21.9911485751286 but that's close to 22

Answer 20

Okay thank you.

Answer 21

What about number five?

Answer 22

I'm getting 14.99476323

Did you get that as well?

Answer 23

Yes rounded it to 5

Answer 24

Four? I missed that

Answer 25

what did you get before you rounded?

Answer 26

For four?

Answer 27

Well it says to round to the nearest tenth.

Answer 28

yes for #4

Answer 29

I am not sure because the thing is that I rounded my whole way through to the nearest tenth

Answer 30

you should only round when you get to the final answer

otherwise, you let the calculator handle the rest

Answer 31

what kind of calculator do you have?

Answer 32

I have a Casio calculator that does not have the pi button.

Answer 33

I see. I'm getting 10.00907753

You can use a calculator like this one

http://web2.0calc.com/

Answer 34

Okay that's pretty close

Answer 35

Six?

Answer 36

what does 6 want?

Answer 37

I think to find the height

Answer 38

it's a bit weird how the instructions aren't given

Answer 39

Yeah

Answer 40

yeah I'm also getting 3.3

Answer 41

Seven?

Answer 42

#7

3.14*(3.5/2)^2*8 = 76.93

you can get more accuracy if you use more digits of pi

pi*(3.5/2)^2*8 = 76.96902001295

Answer 43

Okay thank you. Eight?

Answer 44

2*pi*12.5^2*4+30*17*9 = 8,516.99081698724


2*pi*12.5^2*4 represents the volume of the two cylindrical ends
30*17*9 is the volume of the rectangular prism

Answer 45

So you're close but off a bit. There was a rounding error somewhere

Answer 46

Thanks for letting me know about that. Nine?

Answer 47

Retry #9 using the calculator I gave you

Answer 48

your answer is close but not quite there

Answer 49

ok

Answer 50

@jim_thompson5910

Answer 51

http://web2.0calc.com/#pi*(13/2)^2*28-pi*(4.5/2)^2*28=

Answer 52

hit enter when you get to the link so you can compute it

Answer 53

I look for that later i am running out of time

Answer 54

pi*(13/2)^2*28 is the volume of the outer cylinder
pi*(4.5/2)^2*28 is the volume of the inner cylinder


Total volume = (outer cylinder volume) - (inner cylinder volume)

Answer 55

can you just say whether my answers are correct or not? I have 3 percent charge left on laptop.

Answer 56

#10 I'm getting 101.292563133926 so that rounds to 101.3 gallons

Answer 57

thanks :) the last three? you don't have to rush or anything. just as much as you can

Answer 58

#11 is just way off. I'm not sure how you got that

Answer 59

min: pi*(1.5/2)^2*50*12 = 1,060.28752058656
max: pi*(6/2)^2*50*12 = 16,964.6003293849

Answer 60

didn;t you say to convert them?

Answer 61

one is in inches and the other is in feet so i converted it to feet @jim_thompson5910

Answer 62

I converted everything to inches

Answer 63

50 ft = 50*12 inches

Answer 64

ok i will check that. i have to go now. thank you so much!!!