Two lighthouses flash their lights every 20 and 30 seconds respectively. given that they flash together at 8 p.m., at what time will they next flash together? answer:
1 answer:
Do you remember when you were learning about Least Common Multiple (LCM) ? And you were wondering what on Earth you would ever need it for ? THIS IS IT ! The amount of time after 8 PM when the lights will flash together again is the LCM of 20 seconds and 30 seconds. Do you remember how to find it ? ... When 20 is prime-factored, you have 2 · 2 · 5 . ... When 30 is prime-factored, you have 2 · 3 · 5 . ... So the Least Common Multiple of 20 and 30 is 2 · 2 · 3 · 5 = 60 . The lighthouses will flash together again in 60 seconds after 8 PM. That'll be 8:01 PM.
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90 and 70 because that bahajksjsniskw
Answer:
70 in^2.
Step-by-step explanation:
The area of the whole shape = 5 * 14 = 70 in^2.