Suppose sin(x)=4/5 and cos(x)<0. What is the value of cos(2x)?

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?

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

The sum of five and a number n is at least 12