Solve each given equation and show your work the whether each equation has one solution, an infinite number of solutions, or no solution. explain your answer.
2x+4(x-1)=2+4x
25-x=15-(3x+10)
4x=2x+2x+5(x-x)

Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

10 ! in a race, nick is 50 feet in front of jay after ten seconds. how fast can nick run, if jay can run 20 feet per second?