Please help me im tired

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 anwser cause i do not understand just plez

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.