SOLUTION: please help me in the following algebra questions and don't use iteration=http://postimage.org/image/ogyxi2k1n/full/

Algebra ->  Equations -> SOLUTION: please help me in the following algebra questions and don't use iteration=http://postimage.org/image/ogyxi2k1n/full/      Log On


   

Question 629575: please help me in the following algebra questions and don't use iteration=http://postimage.org/image/ogyxi2k1n/full/
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
46 a)
d = r*t
t = d/r
On the sand, d = 20 - x meters
t = (20-x)/6.4 seconds
------------------
Swimming, d+=+sqrt%28x%5E2+%2B+144%29 meters
t+=+sqrt%28x%5E2+%2B+144%29%2F0.9 seconds
-----------------
b)
t%28x%29+=+%2820-x%29%2F6.4+%2B+%28sqrt%28x%5E2+%2B+144%29%2F0.9%29
----------------
c)
Using graphical methods, x =~ 1.7045 meters
That's the value of x for the minimum total time to from A to B with the speeds given.
=============
The exact value of x = sqrt%28116.64%2F40.15%29
x =~ 1.704437 meters
--------------------------
Elvis has to do some good cornering to detect a difference.