a street built in the city must be 25 feet in width. Streets that are not within 0.5 of this required width must be rebuilt. Which of the following inequalities can be used to determine if the width falls within the acceptable range?

Me find the answers and explain the process to find the answer of the problem appreciate it : )

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

When a number is decreased by 9.9% the result is 40. what is the original number to the nearest tenth? super urgent