Posted by **Sarah** on Wednesday, August 17, 2011 at 7:54am.

1. make p the subject:

p/p-3= R

2. make R the subject

a= 1- 1/R

- Mathematics -
**Reiny**, Wednesday, August 17, 2011 at 8:01am
You must mean

p/(p-3) = R

cross-multiply

Rp - 3R = p

Rp - p = 3R

p(R-1) = 3R

p = 3R/(R-1)

for the second, multiply each term by R, rearrange and factor in a similar way.

Let me know what you get.

- To Reiny -
**Sarah**, Wednesday, August 17, 2011 at 8:27am
So for the second one, I multiplied each term by R

aR= R- 1

but then I got stuck after that... sorry

- Mathematics -
**Reiny**, Wednesday, August 17, 2011 at 8:30am
you are looking for R, so get the R's to one side

aR - R = -1

factor out the R

R(a-1) = -1

divide both sides by a-1

R = -1/(a-1)

## Answer This Question

## Related Questions

- 12th grade maths - just like to check if ive got these right. if not can you ...
- 12th grade maths - just like to check if ive got these right. if not can you ...
- mathematics-change of subject of the formula - A=πr√(h^2-r^2) make "r...
- mathematics-change of subject of formula - A=πr√(h^2-r^2) make "r" ...
- maths-check my answers - Please check my answers 1) make c the subject of the ...
- social studies - Which of the following best describes the difference between a ...
- Mathematics - Make x the subject of the relation:1+ax 1 -ax =p/q
- math - 500 students sat for an examination in mathematics,physics and chemistry....
- Mathematics - make x the subject of the formula y=2x+3 x-4 hence determine the ...
- math subject - make (a) the subject 2a+2a^2=10 please and thank you (the 2a^2 ...

More Related Questions