Aschool buys 200 calculators at a special price. x of them were scientific calculators at r 89 a piece and the rest were financial calculators at r 599 a piece. an expression in terms of x, for the total number of calculators bought is?

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