QuestionSolve the following equations for the indicated variable:
27. $I=P r t$ for $P$
28. $C=2 \pi r$ for $r$
29. $T=D+p m$ for $p$
30. $P=C+M C$ for $M$
31. $A=\frac{1}{2} h(a+b)$ for $a$
32. $A=\frac{1}{2} h(a+b)$ for $b$
33. $S=P+$ Prt for $r$
34. $S=P+$ Prt for $t$
35. $B=\frac{F}{S-V}$ for $S$
36. $S=\frac{C}{1-r}$ for $r$

Studdy Solution
For the tenth formula, $=\frac{C}{-r}$ , we are asked to solve for $r$ . We can do this by multiplying both sides of the equation by $-r$ , then subtracting $$ from both sides and dividing by $-$.
$r = - \frac{C}{}$

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