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Mathematics 7 Online
OpenStudy (anonymous):

(1.) Riley noticed an aquarium in his father’s office. The aquarium had the dimensions 16 in. by 8.5 in. by 10.5 in. The formula for volume is: V = l × w × h. (a) Riley also thought that the surface area would triple. Is Riley correct? How many times greater is the surface area of the larger aquarium than the smaller? Show your work and explain your reasoning.

OpenStudy (anonymous):

@Utterly_Confuzzled Plz help

OpenStudy (anonymous):

Plz hurry!

OpenStudy (anonymous):

@sleepyjess

OpenStudy (sleepyjess):

Can you put the full question here?

OpenStudy (anonymous):

is that better?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

ok

OpenStudy (sleepyjess):

I'm still not completely sure what the question is. Riley also thought that the surface area would triple. also? It looks like there is still something missing

OpenStudy (anonymous):

no he is yes

OpenStudy (anonymous):

medal me

OpenStudy (anonymous):

so hte answer is yes!!

OpenStudy (anonymous):

can you medal me?

OpenStudy (sleepyjess):

@anthony81864327158756 , Please do not give out direct answers

OpenStudy (sleepyjess):

What are the dimensions of the larger aquarium? the smaller aquarium?

OpenStudy (anonymous):

ok

OpenStudy (sleepyjess):

No, I am not a teacher

OpenStudy (anonymous):

i have one questions but there are different type of questions they are like (a) (b) and (c) i am on letter (C)

OpenStudy (anonymous):

?

OpenStudy (sleepyjess):

It would be better if you posted the full question and all parts in a reply. That way we can see what you are having trouble with, as well as the full context of the problem.

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

i will just do it on my own then

OpenStudy (sleepyjess):

If you tell me the dimensions of the aquariums I will help you

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

well it doesnt tell me the dimension of the larger it just tells me to triple it from the smaller one

OpenStudy (anonymous):

the demenstions from the smaller one are 16 in. by 8.5 in. by 10.5 in.

OpenStudy (sleepyjess):

Ok, then. So, if we triple all 3 dimensions, then we will have 48 by 25.5 by 31.5 .

OpenStudy (anonymous):

what?

OpenStudy (anonymous):

umm ok

OpenStudy (sleepyjess):

So, here is our larger aquarium |dw:1420323214611:dw|

OpenStudy (sleepyjess):

What does triple mean?

OpenStudy (anonymous):

what do you mean?

OpenStudy (sleepyjess):

You said "what?" and "umm ok", so that tells me you do not understand.

OpenStudy (anonymous):

can you guys plz hurry i have to go in 3 minutes!

OpenStudy (utterly_confuzzled):

The formula for surface area is 2(lw) + 2(lh) + 2(wh) In this case, lets say 16=l 8.5=w and 10.5=h Take those, multiply them by 3 and then plug them nto the formula and let me know what you get. I'll help you with what to do after that

OpenStudy (sleepyjess):

This isn't where you get answers fast, it is where you learn how to do the problem.

OpenStudy (anonymous):

i know but i am in a huge hurry

OpenStudy (anonymous):

(1.) Riley noticed an aquarium in his father’s office. The aquarium had the dimensions 16 in. by 8.5 in. by 10.5 in. The formula for volume is: V = l × w × h. (a) Riley also thought that the surface area would triple. Is Riley correct? How many times greater is the surface area of the larger aquarium than the smaller? Show your work and explain your reasoning.

OpenStudy (sleepyjess):

@anthony81864327158756 , if you aren't going to help, please do not spam the post.

OpenStudy (anonymous):

multiply 16 8.5 10.5 then you get!!

OpenStudy (sleepyjess):

All you have to do is solve for the surface are of each aquarium

OpenStudy (anonymous):

ok

OpenStudy (sleepyjess):

\(\sf A=2(wl+hl+hw)\)

OpenStudy (anonymous):

1428in.

OpenStudy (utterly_confuzzled):

The original is 786.5 The new one would be 2(48*25.5) + 2(48*31.5) + 2(25.5*31.5) That equals 7078.5 From there you need to divide the second aquariums surface area by the original surface area. The number you get will answer both questions because it will give you how many times larger it is. Does that make sense?

OpenStudy (anonymous):

no

OpenStudy (anonymous):

that is volume

OpenStudy (anonymous):

not perimeter

OpenStudy (sleepyjess):

For the small aquarium: 16 = l 8.5 = h 10.5 = w For the large aquarium: 48 = l 25.5 = h 31.5 = w

OpenStudy (anonymous):

so is he correct?

OpenStudy (sleepyjess):

What are you talking about @anthony81864327158756

OpenStudy (anonymous):

i dont know what are you?

OpenStudy (sleepyjess):

@Utterly_Confuzzled is correct

OpenStudy (anonymous):

so Riley is correct?

OpenStudy (anonymous):

you dont know what your saying

OpenStudy (anonymous):

im 60 years old

OpenStudy (anonymous):

im a teacher and a retired person

OpenStudy (sleepyjess):

Well, you don't know what your talking about

OpenStudy (anonymous):

so riley is correct or incorrect?

OpenStudy (anonymous):

how are you talking to me?

OpenStudy (utterly_confuzzled):

Who is Riley?? But I'm 99% sure I'm right.

OpenStudy (anonymous):

Riley the boy in my problem

OpenStudy (utterly_confuzzled):

No, Riley is incorrect

OpenStudy (anonymous):

ok so riley is incorrect

OpenStudy (sleepyjess):

What is 7078.5/786.5? Does it equal 3?

OpenStudy (utterly_confuzzled):

Because 7078.5 / 786.5 = 9 This is to be expected because 3(the factor) squared is 9

OpenStudy (anonymous):

ok so how many times greater is the surface area of the larger aquarium than the smaller?

OpenStudy (utterly_confuzzled):

That means the surface area of the second fish tanks is 9 times greater.

OpenStudy (anonymous):

so riley is incorrect

OpenStudy (utterly_confuzzled):

Right. Riley is incorrect because it is 9 times larger, not 3

OpenStudy (anonymous):

oh ok

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