Ten percent of 640 is what number? a. 64 b. 128 c. 160 d. 230

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.

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the sunflower? ? plz write a proportion to solve i will give you 100 points

In 3 years, dianna will be 4 times as old as she was 33 years ago. how old is dianna now? translate the phrase "in 3 years" into algebraic terms.