In a box of 20 pens, 4 of them are red, 10 are blue and rest are black what percentage of pens are black

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

Through non-collinear points there is exactly one plane.

If you answer 2+2 you will get over 80 points