Mathematics: How to solve for r in: c=k(rr/r-r)

How to solve for r in: c=k(rr/r-r) - id1712883, EstherAbuwaah

Ответ:

AikawaAisyah2080

05.08.2019

I'll assume you mean $c = k\left(\dfrac{rr}{r-r}\right)$ (tell me if i am wrong).first, we can multiply k into the fraction. $\begin{aligned} c & = k\left(\dfrac{rr}{r-r}\right) \\ c & =\dfrac{k r r}{r-r} \end{aligned}$ we can multiply both sides by $r-r$ to cancel out the denominator. $\begin{aligned} (r-r)\cdot c & =\dfrac{k r r}{r-r} \cdot(r-r) \\ c(r-r) & = k r r \end{aligned}$ distribute c into the left side. $\begin{aligned} c(r-r) & = k r r \\ cr - cr & = krr \end{aligned}$ if you want to solve for r, move everything with an r to one side. i will choose left side for this. then move everything without an r to the other side.so subtracting both sides by krr gets us $cr - cr - krr = 0$ adding cr to both sides gets us $cr - krr = cr$ factor our r from the left side. $r(c-kr) = cr$ divide both sides by c-kr $\begin{aligned} r & = \frac{cr}{c-kr} \end{aligned}$

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Ответ:

NCT2005

27.07.2021

Mathematics

8:7 means there are 15 parts so divide 195 by 15

195/15 = 13, this means that each part is 13

8 x 13 = 104

7 x 13 = 91

so 104:91

there are 104 boy campers to 91 girl campers

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How to solve for r in: c=k(rr/r-r)

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