Two warning lights flash on the fences of Jurassic Park. One light flashes every 3 seconds. Another light flashes every 4 seconds. How many times will they flash at the same time over the course of one minute?

Which of the following are independent events? a) knowing that it is going to rain tomorrow, and bringing an umbrella to schoolb) knowing that you have to get up early tomorrow, and going to bed before 9 p.mc) knowing that it is going to rain tomorrow, and going to bed before 9 p.md) knowing that you have a test in school tomorrow, and studying thw night before