Answer:
![\left\{\begin{array}{l}x=r\cos t\\ \\ y=r\sin t\\ \\z=at\end{array}\right.](https://tex.z-dn.net/?f=%5Cleft%5C%7B%5Cbegin%7Barray%7D%7Bl%7Dx%3Dr%5Ccos%20t%5C%5C%20%5C%5C%20y%3Dr%5Csin%20t%5C%5C%20%5C%5Cz%3Dat%5Cend%7Barray%7D%5Cright.)
Step-by-step explanation:
A <u>helix</u> is a curve for which the tangent makes a constant angle with a fixed line. The shortest path between two points on a cylinder (one not directly above the other) is a fractional turn of a helix, as can be seen by cutting the cylinder along one of its sides, flattening it out, and noting that a straight line connecting the points becomes helical upon re-wrapping (see attached diagram for helix).
The parametrization for the helix is
![\left\{\begin{array}{l}x=r\cos t\\ \\ y=r\sin t\\ \\z=at\end{array}\right.,](https://tex.z-dn.net/?f=%5Cleft%5C%7B%5Cbegin%7Barray%7D%7Bl%7Dx%3Dr%5Ccos%20t%5C%5C%20%5C%5C%20y%3Dr%5Csin%20t%5C%5C%20%5C%5Cz%3Dat%5Cend%7Barray%7D%5Cright.%2C)
where
is the radius of the helix,
is the constant, and
is the parameter
The correct answer is:
[A]: "
![\frac{3}{4}](https://tex.z-dn.net/?f=%20%5Cfrac%7B3%7D%7B4%7D%20)
" .
______________________________________________________<u>Note</u>: "3/4" = "6/8" = "15/20" .
______________________________________________________
You would need to explain base ten and base 8
Answer:
C) 43.96
Step-by-step explanation:
1. Use the formula to find the circumference of a circle whic is C= πR
2. First multiply the radius (7 in) by 2
3. 7 x 2 = 14
4. Then multiply 14 by 3.14
5. 14 x 3.14 = 43.96
5. There's your answer :)
Hope this helps :)