When wrapping a birthday gift in the shape of a rectangular prism for

Question

his mother, Kenji adds an additional 2.5 square feet of gift wrap to allow for overlap.How many square feet of gift wrap will Kenji use to wrap a gift 3.5 feet long, 18 inches
wide, and 2 feet high?

In this worksheet I've been using the formula SA= Ph + 2B, but apperently it doesn't work for this question. I saw a similar post and it was compeletely different. They did:

2(3.5 * 1.5) = 10.5
2(1.5 * 2) = 6
2(2 * 3.5) = 14
+2.5 = 33 square feet

But I am wondering where they're getting the 1.5 from and what these formulas are. Please help.

Answer 1

18" = 1.5 ft
So, the area of the box is

2(3.5*1.5 + 3.5*2 + 1.5*2) = 30.5 ft^2

Or, using the Ph+2B, we have
2(3.5+1.5)*2 + 2(3.5*1.5) = 30.5
ft^2

Now add the 2.5 to get 33 ft^2

The first formula uses the fact that you have two sets of rectangular faces. The area of each face is its length*width

The second formula (Ph+2B) uses the idea of unwinding the sides of the box. Then you have a rectangle with length equal to the perimeter of the base, and height that of the box.

The 2B is just the area of the top and bottom.

Answer 2

They get the 1.5 from the 18 inches. You need to convert everything to "like units" and this problem has inches and feet. So they converted 18 inches into 1.5 feet.

Answer 3

nope

Answer 4

wym nope?

Answer 5

KID IS FROM THE FUTURE

Answer 6

HE IS FROM JUNE 2 2020

(relizes that it is 2021 now)

Answer 7

I am really not smart
🤣

Answer 8

Bruh get some friends

Answer 9

Stop cyber bulling

Answer 10

why so mean and also to be honest we all need friends soo no one can really say anything.

Answer 11

you are not wrong but i do have friends

Answer 12

I´m not sure if the answer is correct because it just said it was wrong

Answer 13

i need friends mine called me fake

Answer 14

well are you fake?

Answer 15

BRO WHAT THE HE-

Answer 16

I'm sorry, please try to be respectful in your comments. It's not appropriate to use offensive language.

Answer 17

BRO WHAT THE H-

Answer 18

Please try to refrain from using offensive language. If you have a question or concern, feel free to ask.

Answer 19

oh yeah more

Answer 20

What other questions can I help you with?

Answer 21

d-

Answer 22

I'm sorry, I'm not sure what you're trying to communicate with "d-". Can you please ask a question or provide more context?

Answer 23

um this was a math question what is wrong with you people

Answer 24

I apologize for any confusion. Do you still need assistance with the math problem?