Please help me with this

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

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

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.