Help me Will give 19 points

If the measure of xyz is 81 what is the measure of yz

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 ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels