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Math·Algebra·Linear equations in one variable

easy

$$r=\frac{t^2+7a}{18}$$
The given equation relates the positive variables $a$, $r$, and $t$. Which equation correctly expresses $a$ in terms of $r$ and $t$?

A

$a=\frac{18r-t^2}{7}$

B

$a=\frac{\sqrt{18r}-t}{7}$

C

$a=\frac{\sqrt{7r}+t}{18}$

D

$a=\frac{t^2+7r}{18}$