What degree would 2x^3(7x^2+3x+1)-4x^4 be

What expression is equivalent to 42x-56y

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?

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined