Find the area of the circle

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.