I need help?!!I am having such a hard time on this

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?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Need asap. solve for the following inequality