Question

Can someone walk me through this...
Everytime I do it, I get an answer that isn't in the multiple choices...

Answer 1

Concrete can be purchased by the cubic yard. How much will it cost to pour a slab 11 feet by 11 feet by 3 inches for a patio if the concrete costs $63.00 per cubic yard?

Answer 2

Multiple choice answers :
A. $211.75
B. $70.58
C. $317.63
D. $1,905.75

Answer 3

convert your measures into yard units

Answer 4

I did.

Answer 5

I'll show all my work.

Answer 6

Volume of Rectangular Prism = whl
11 feet = 132 inches
132*132*3 = 52,272 cubic inches

Answer 7

52,272/12 = 4,356 cubic feet

Answer 8

4,356/3 = 1,452 cubic yards

Answer 9

1,452 yards * 63$ = $91,476

Answer 10

That's a freaking expensive patio.....

Answer 11

11 feet = 11 (1/3) yards, since a foot is 1/3 of a yard

3 inches = 3 (1/12) feet = 3(1/12)(1/3) yards

Answer 12

I just converted it all to inches, and then back to feet, and then to yards...
Wouldn't that work??

Answer 13

only if you do it right, id just work it all to yards to avoid so many chances for error to creep in

Answer 14

I can't find any errors....Can you?
I will work it all to yards...

Answer 15

(11/3 * 11/3 * 1/12) cubic yards, times 63

Answer 16

Why 1/12?

Answer 17

63*169/108

Answer 18

Even that answer is wrong....

Answer 19

There MUST be a typo in this question.....I'm not this bad at math lol :P

Answer 20

3(1/12)(1/3) = 1/12

Answer 21

3 inches is 3/12 = .25 feet, and .25 of 1/3 of a yard is well, 1/12 of a yard

Answer 22

Right

Answer 23

But even the answer we would get from that is "wrong"

Answer 24

I'm going to bring this to my teacher's attention....

Answer 25

11*11 = 121 .... not 169 :)

Answer 26

63*121/108 is better

Answer 27

WOOO! Alright. $70.58...
Certainly a huge difference from spending Over 91 thousand dollars. Hahahaha

Answer 28

Thanks man have an awesome day!!! ;)

Answer 29

yeah

your conversions must have been in error, the more you try to convert back and forth the more room there is for error

in my approach, i made an error and that was only a single step ...

Answer 30

True that.... I don't know where my error was but it's all okay :)

Answer 31

if we convert to inches

1 cubic yard = 3*3*3 cubic feet = 36*36*36 cubic inches

11*12 = 132 inches

132*132*3 52272
--------- = ------- = 1.12
36*36*36 46656


63(1.12) = 70.56

Answer 32

you didnt use cubic dimension

52272 cubic inches is not converted by 12 cubic inches: 12 is a linear measure, not a cubic measure.

12^3 is what you should have used

52272 cubic inches = 52272/12^3 cubic feet

there arent 3 feet in a cubic yard, there is 3^3 cubic feet in a cubic yard

that was your errors