Ared blinking light blinks every 18 seconds, while a yellow blinking light blinks every 12 seconds. if both lights start at the same time, after how many seconds will they next blink at the same time? a) 6 b) 18 c) 36 d) 54

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )