Can someone explain what Order of Magnitude is? NO GOOGLE SEARCHES PLZ

Write the converse of the following statement: if the trees have no leaves, then it is fall. if the trees have no leaves, then it is fall. the trees have no leaves, therefore it is fall. it is fall since the trees have no leaves. if it is fall, then the trees have no leaves.

Acar travels at an average speed of 56 miles per hour. how long does it take to travel 196 miles

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75