How do you simplify 12r+5s-7t+11r+9s-4r

Use the distributive law to multiply. 3(4x + 5y + 6)

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

The holiday party will cost $160 if 8 people attend. if there are 40 people who attend the party, how much will the holiday party cost