Pls help me(this is world geography)

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

Question 51 ptssolve. assume the exercise describes a linear relationship.marty's tee shirt & jacket company is to produce a new line of jackets with a embroidery of atpvtenpoeyiliceorsuit ut itoare fixed costs of $59 u to set ud for production, andvariable costs of $39 per jacket. write an equation that can be used to determine the total costencountered by marty's company in producing x jackets. use the equation to find the total cost ofproducing 50 jackets.$2520s2532o $2540s2552

The first atomic explosion was detonated in the desert north of alamogordo, new mexico, on july 16, 1945. what percentage of the strontium-90 ( yr) originally produced by that explosion still remains as of july 16, 2016?