Devin and Karissa are 210 feet apart when they start walking toward one another. They are walking at the same speed, so whenever Devin travels some number of feet, Karissa travels the same number of feet. Let x represent the number of feet each of them traveled.a. Write an expression in terms of x to represent the total number of feet Devin and Karissa have walked toward one another.b. Write an expression in terms of x to represent the distance (in feet) between Devin and Karissa.

Answer:a)[tex]2x[/tex]b)[tex]210-2x[/tex]Step-by-step explanation:Total distance between Devin and Karissa is 210 feetLet x be the distance traveled by Devin towards karissaWe are given that Karissa travels the same number of feet.Total distance traveled by  Devin and Karissa =[tex]x+x[/tex]                                                                              =[tex]2x[/tex]So,an expression in terms of x to represent the total number of feet Devin and Karissa have walked toward one another is [tex]2x[/tex]Remaining distance = Total distance - Distance traveled                                 = [tex]210-2x[/tex]So,an expression in terms of x to represent the distance (in feet) between Devin and Karissa is [tex]210-2x[/tex]