Why is cos(nπ) = (–1)n true, when n could be any integer?

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

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

Percent increase and decrease. original number: 45 new number: 18