Simplificar expresiones algebraicas

Me find the measure to side c and the process to solve the problem you appreciate it : )

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9