Given the ordered pairs (-3, -7), (-2,-5),(-1, -3) and (0, -1), which set shows the domain of the function?

Can someone me and plz do the problem

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

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?