There is a string of red and blue lights strung around a window . The red lights blink every 3 seconds , and the blue lights blink every 5 seconds , how many times will they blink at the same time in one minutes ?

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.