Wheres the picture or the problem????
Answer:
hi 40.1 i need friend
Step-by-step explanation:
<em><u>In gamma-ray astronomy, gamma-ray bursts are immensely energetic explosions that have been observed in distant galaxies. They are the brightest and most energetic electromagnetic events known to occur in the universe. Bursts can last from ten milliseconds to several hours</u></em>
The answer is 7. Because $21.50-4=17.50 and then 17.50÷2.50=7