The x-term has a coefficient of 2, and the z-term has a coefficient of -1. the expression has a constant term less than zero. which expression could he have written?
a: 2x + z + 5 - 6z2
b: 2x - z - 5 + 2z2
c: -2x - z - 5 + 2z2
d: -2x + z - 5 + 2z2

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?