Câu 21: [TMD] Cho hàm số f x( ) có đạo hàm liên tục trên R và có đồ thị hàm số y f x  '( ) như hình vẽ bên dưới. Hỏi hàm số f x 2sin 1  nghịch biến trên khoảng nào dưới đây ?

Scarlet bought three pairs of sunglasses and two shirts for $81 and paula bought one pair of sunglasses and five shirts for $105 what is the cost of one pair of sunglasses and one shirt?

Don't know how to find x given these segment lengths

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?