I need help on this question

41/17 as a decimal rounded to the nearest hundredth

Consider the linear function that is represented by the equation y= 4x+5

Situation: an archaelogist in turkey discovers a spear head that contains 54% of its original amount of c-14. n = noekt no = inital amount of c-14 (at time t = 0) n = amount of c-14 at time t k = 0.0001 t = time, in years find the age of the spear head to the nearest year