blem $4-5$ Calculating the Number of Periods

e for the unknown number of years in each of the following. $($Do not round mediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

$\backslash$table$[[$esent Value,Years,Interest Rat,,,e Value$],[610,2\mathrm{.}13,7,\%,$$$,1,389],[940,,8,,,1,821],[26,350,,9,,,289,715],[43,500,,11,,,430,258]]$