![kelseiroll9759](/avatars/42966.jpg)
kelseiroll9759
18.03.2021 •
Mathematics
if you buy one ticket everyday for 365 days and get a result of 1 winning tickets, is 1 a significantly low number of winning tickets? why or why not?
Solved
Show answers
More tips
- C Computers and Internet How to Set Up Internet on iPhone? Detailed Guide with Step-by-Step Instructions...
- P Philosophy 8 привычек, чтобы достичь счастливой жизни...
- F Food and Cooking How Many Grams Are In a Tablespoon?...
- G Goods and services How to Choose the Right Iron: Purchase Tips...
- S Style and Beauty How to Choose the Perfect Hair Straightener?...
- H Health and Medicine How to Choose the Right Glasses?...
- H Health and Medicine What vaccines do children need?...
- H Health and Medicine AKDS Vaccination: Ensure Your Child s Safety...
- H Health and Medicine Flu: How to Recognize It by the First Symptoms?...
- H Health and Medicine What to Do If You Are Bitten by a Dog?...
Answers on questions: Mathematics
- M Mathematics Help! 5 easy math questions (Order of Operations) ( 10+14 ) divided by ( 13-5 ) 8 x 3 x (10+6) (9 + 36 - 5) divided by 8 ( 8-4 ) + 10 divided by 5 ( 8+27 - 5) divided...
- M Mathematics Each patron can borrow up to 6 books. If all the patrons are currently holding on to 6 books each, how many books are left in the library?...
- M Mathematics 12. The ratio of z and 2 is represented as... a. 32 b. 2/2 c. 22 d. 2+2...
- E English What happens shortly after victor destroys the female?...
- A Arts If you were an art dealer, and your client was the artist you selected...what would be their most difficult piece to sell, and why?...
- S Social Studies Do you think you would be able to memorize all the 10-codes on the list, or would you have to refer to a chart? It would take long time for me to remember it. Aside...
Ответ:
The solution for this problem is:
Cut wire so first piece has length x.
Second piece has length (72 - x).
Use piece of length x to make circle.
c = circumference, r = radius
c = 2πr = x
r = x/(2π)
A(circle) = πr² = π * (x/(2π))² = x²π/4π² = x²/4π
Use piece of length (72-x) to make square.
s = side length = (72-x)/4
Area(square) = s² = ((72-x)/4)² = (72-x)²/16 = (5184 - 144x + x²)/16
Area(square) = 324 – 9x + x²/16
A = A(circle) + Area(square)
A = x²/4π + 324 - 9x + x²/16
A = x²/4π + x²/16 – 9x + 324
A = 4x²/16π + πx²/16π - 9x + 324
A = (4+π)/16π x² - 9x + 324
This is the function of a parabola that opens up.
To look where A is minimum, you can rewrite equation in vertex form or find where derivative = 0.
A' = 2(4+π)/16π x - 9 = (4+π)/8π x - 9
A' = 0
(4+π)/8π x - 9 = 0
(4+π)/8π x = 9
x = 9*8π / (4+π)
x ≈ 31.7 inches