State the domain and range and state if it is a function or not​

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?

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?