To log on to a certain computer account, the user must type in a 3 -letter password. in such a password, no letter may be repeated, and only the lower case of a letter may be used. how many such 3 -letter passwords are possible?

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

Someone me! if you’re smart you can solve this!

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?