Evaluate the expression -2 x y

What is the approximate circumference of the circle shown below?

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?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)