Since 12.3 is kind of a margin that you have to fit by, the total weight of the golf clubs must be lesser than or equal to 12.3. So, that's your expression:

x represents the number of golf clubs you have.
If this doesn't make sense, feel free tell me!
Answer:
V = 120.6796
LA = 110.8513
SA = 174.8513
Step-by-step explanation:
Let me know if you need more of an explanation for any of these
First we need the height, one way to find that out is to use the diagonal of the and one of the diagonal edges of the pyramid. Specifically we will need half of the diagonal of the square. We will call the diagonal of the square d.

Gonna leave it like that for ease of writing. So then half of the diagonal is 
The height, h, will be
. Plugging everything in gets us 
last, we need to find slant height, which we will call s.

s is also the height of the triangles for purposes of finding area. Now for the volume and areas.
Volume is area of the base times height divided by 3, so 
Lateral area is the sum of the four areas of the triangles, and each of those are
so the whole lateral area is 4 times that. So we get 
Total surface area is the lateral surface area + the area of the base, so 110.8513 + 64 = 174.8513
3/5 converted to percentage gives 60%
How do we convert a fraction to a percentage?
First and foremost, the maximum percentage value any number could have is 100% , hence, in order to convert a number or fraction or even a decimal to percentage, we simply multiply it by 100
3/5 to percent:
In order to convert 3/5 to percentage, we would multiply by 100
3/5=3/5*100
3/5 in percent=300/5
3/5 in percent=60
3/5 in percent =60%
As a result, the correct option is 60%,which is the third option, option C
Find out more about percentage on:brainly.com/question/18488471
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Full question:
Convert 3/5 to a percent.
A.30%
b.35%
c.53%
d.60%