Question

Did I do this right?
SA= 2(3 ½ + 11 ½ ) + 2(11 ½ + 11 ¾ ) + 2(3 ½ + 11 ¾ )
SA = 2(30) + 2(46.5) + 2(30.5)
SA= 60 + 93 + 61
SA= 214

Answer 1

It looks like you already multiplied everything by two in the second step and put it in parenthesis. So, the additional 2 outside would not be needed at this point.

Answer 2

SA = 2(15) + 2(23.25) + 2(15.25) should be what you have in step 2.

Answer 3

Basically step 2 should be SA = 2(15) + 2(23.25) + 2(15.25).

Answer 4

oh ok

Answer 5

So all i have to do is do SA = 2(15) + 2(23.25) + 2(15.25) and get my answer?

Answer 6

It looked like you accidentally multiplied by 2 going to that step and didn't realize it. Otherwise it would be (30) + (46.5) + (30.5). But that would require two steps.

Answer 7

correct

Answer 8

ok let me see what i get

Answer 9

ok 107?

Answer 10

That is correct. Also there is another way you could have done it which would give the same answer. Since everything is multiplied by 2, you can separate it and add everything else together.

Answer 11

yea i think i would have liked it better that way

Answer 12

SA= 2(3 ½ + 11 ½ ) + 2(11 ½ + 11 ¾ ) + 2(3 ½ + 11 ¾ )
SA = 2(3 ½ + 11 ½ + 11 ½ + 11 ¾ + 3 ½ + 11 ¾ )
SA= 2(53 ½)
SA= 107

Answer 13

i have another question can you just explain it to me what it means?

Answer 14

4. What is the surface area of the box if it is scaled up by a factor of 10?
its with the same question i asked before

Answer 15

I dont know what it wants me to do

Answer 16

Scaling something by a factor essentially means multiplying everything in the equation by that factor.

Answer 17

Since your factor is 10, you would simply multiply the Surface Area you already have by that factor (10).

Answer 18

so 107/10?

Answer 19

107 * 10

Answer 20

Out of curiosity, what was the original question that brought you to your work that you originally asked about?

Answer 21

1,070 right?

Answer 22

1. List the dimensions of your box. Be sure to include the units (in, cm, ft., etc.).
2. Describe the shape of the cross section when the box is cut parallel to the base.
3. What is the surface area of the box?
4. What is the surface area of the box if it is scaled up by a factor of 10?
5. What is the volume of the box?
6. What is the volume of the box if it is scaled down by a factor of ½?

Answer 23

OK, we need to back up to your original question as you set up the formula wrong.

Answer 24

ok ok
#work lol

Answer 25

hehe, it happens. Did you have to pick an item to measure or was dimensions already give to you?

Answer 26

i had to pick it

Answer 27

i just chose a binder

Answer 28

The formula for SA is 2 ( lw + lh + hw) or 2(lw) + 2(lh) + 2(hw) where the letters besides each other mean to multiply, not add.

Answer 29

Sorry, I didn't think about your equation when you asked, was just making sure the math was correct.

Answer 30

So, you would be multiply fractions by using those measurements.

Answer 31

Would you like to try something different or keep with the binder?

Answer 32

um i already have the measurements so keep it lol

Answer 33

Ok, so now you would have
SA= 2(3 ½ * 11 ½ ) + 2(11 ½ * 11 ¾ ) + 2(3 ½ * 11 ¾ )

Answer 34

135.125?

Answer 35

SA= 2(3 ½ * 11 ½ ) + 2(11 ½ * 11 ¾ ) + 2(3 ½ * 11 ¾ )
SA= 2(40.25 ) + 2(135.125 ) + 2(41.125 )

Answer 36

sorry, this place is annoying with fractions. .125 would be 1/8