Johnny must learn more than 10 new plays before the big game. he has already learned 4. write an inequality that represents how many more plays he needs to learn to reach his goal?

He needs to learn >10 new plays, but has already learned 4. Therefore, the inequality is x+4>10, where x is the amount of new plays he must learn, 4 is the amount he has already learned and >10 (more than 10) is the amount of plays he needs to learn in total. 
x+4>10
x>6 is the solved inequality