PLEASE CHECK PLS HELP AND FIND ANSWER

The blue segment below is a diameter of o. what is the length of the radius of the circle?

What percent of $1.00 are a nickel and a dime?

Situation: find the age of the skull to the nearest year, enter the correct answer. a hiker in africa discovers a skull that contains 32% of its original amount of c- 14. done n = noekt 00000 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