In a competitive exam 5 marks are awarded for every correct answer 2 marks are discued for every wrong answer and 0 marks are given for not answering a question .Find the source of a boy who attempt all question (20) but only 12 answer are correct

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

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x