Simplify the polynomial 3x^2+5x-5x^2-4x+5-2

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?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Can someone answer this question for me