pleaseee explain
round to the nearest decimal point

Given the following relation:
[tex] \frac{1}{A } = \frac{55}{26} \\ [/tex]
We can solve for A, by taking the reciprocal on both sides, meaning we flip the fractions. This operation does not change our original relation.
[tex] \frac{A}{1} = \frac{26}{55} \\ or \: A = \frac{26}{55} [/tex]
Approximation to the nearest tenth place:
[tex]A = \frac{26}{55} \approx0.4[/tex]