Use the Law of Cosines to find the measure of ∠A. Round to the nearest degree. a = 12, b = 5, c = 9

Use: a² = b² + c² – 2bc cos A

Construct the graph that models the given situation

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Milk and ice cream are mixed together for a recipe. the total volume of the mixture is 1 cup. if the milk contains 2% fat, the cream contains 18% fat ,and the mixture contains 6% fat ,how much cream is in the mixture