Somebody help me pleaseee

Which function has the same domain as y=2x

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?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?