Two lighthouses flash their lights every 20 seconds and 30 seconds respectively. Given that they flash together at 8 p. m, when will they next flash together?

In which form is the following function written? y = - 2(x – 3)(x + 5)

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?