Can someone please help me ASAP (thank you)

Which graph represents the following piecewise defined function?

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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?