Which of the following leading terms would make the expression a perfect square trinomial? −140xy+100y2

A) 49x^2
B) 25x^2
C) 81x^2
D) 64x^2

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

Answer question above and explain each step : )

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?