Isolate a variable?

Assuming you mean S = D * R / (R+H)
then I make
R = (H * S) / ( D - S)

EDIT, just noticed that's the same thing as you have put except the minus's cancel out

yep

R=SH/(D-S)

I took the long way but arrived at the same destination 😉

Maple software output:
R = -S*H/(S-D)

Gosh I need to brush up on my Algebra!!!:cool:

Going to hijack.. Just getting ready to watch Portugal vs Poland at the Stade Velodrome in Marseille FR.
Just blown away from the steel design.
Somebody knows their math.

This is vid from quick google search.
Reminds of the work that you deal with at the wtc site
[MEDIA=youtube]Ajblm_J8X3E[/MEDIA]
Ultimate boys playing with toys.
Lewandowski, the Bayern Munich striker just buried one at 1:45 in for Poland. Could be a long day for Ronaldo and Portugal.

'
Y'all have a great Fourth of July! 😎

[USER=7674]@MathTeacher[/USER] hello, this phone call is for you.

[USER=197]@Brad Ott[/USER] the discussion seemed well in hand, so I didn't comment. The way Scott wrote the original equation, R can't be isolated because R/R = 1. So it seems reasonable that he really meant the equation that [USER=7109]@squowse[/USER] wrote. But some teachers are jerks and give students stuff that's hard to handle just to watch them squirm.

For example, I used to give all of my pre-calculus classes a pre-test on the first day of school. Two consecutive questions were:

1. 0/0 = ?
a. 1
b. No real numbers
c. 0
d. All real numbers

2. 1/0 = ?
a. 1
b. No real numbers
c. 0
d. All real numbers

Jerk for a teacher or not, those problems would generate 15-20 minutes of discussion when students got their papers back.

Without knowing the source of the problem, it's hard to know if some thought-provoking scheme is underway.

MathTeacher, post: 379790, member: 7674 wrote: [USER=197]@Brad Ott[/USER] the discussion seemed well in hand, so I didn't comment. The way Scott wrote the original equation, R can't be isolated because R/R = 1. So it seems reasonable that he really meant the equation that [USER=7109]@squowse[/USER] wrote. But some teachers are jerks and give students stuff that's hard to handle just to watch them squirm.

For example, I used to give all of my pre-calculus classes a pre-test on the first day of school. Two consecutive questions were:

1. 0/0 = ?
a. 1
b. No real numbers
c. 0
d. All real numbers

2. 1/0 = ?
a. 1
b. No real numbers
c. 0
d. All real numbers

Jerk for a teacher or not, those problems would generate 15-20 minutes of discussion when students got their papers back.

Without knowing the source of the problem, it's hard to know if some thought-provoking scheme is underway.

Word.

I believe the parentheses are ambiguous as presented.

in the equation: S = D * (R /R+H) Isolate the term: (R /R+H)

If taken in order of operational precedence it become 1+H. The Rs go away!
But if that is the case why bother with the parentheses?

Perhaps it was meant to imply: (R/(R+H))
What say you?
JAC

Squwose was right.

Are we all a bunch of math geeks or what?

This is fun.

Are you trying to back in and figure out what radius was used to reduce a distance to the ellipsoid? Because of the magnitude of radius of the earth, it is probably not possible to get an exact result, but you could certainly get close enough.