Pls i dont know it

what is the mean absolute deviation of the data set?

{2, 8, 10, 12}{2, 8, 10, 12}

Classify the following triangle check all that apply

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists