One car leaves Kansas City driving toward Denver at the same time that another car leaves Denver driving toward Kansas City. The first car is travelling 75 miles per hour less than three times the speed of the second car. The distance between Denver and Kansas City is 420 miles, and the two cars meet after driving for four hours. Find the speed of each car.

Jonathan pays $1.90 per pound for potatoes. he buys 8.3 pounds of potatoes. he determines that he will pay $15.77, before tax, for the potatoes. which best describes the reasonableness of jonathan’s solution? jonathan’s answer is reasonable because there are two decimal places in the factors and two in the product. jonathan’s answer is unreasonable because there are three decimal places in the factors and two in the product. jonathan’s answer is reasonable because is 16, and 16 is close to 15.77. jonathan’s answer is unreasonable because is 8, and 8 is not very close to 15.77.

Select the correct answer. joshua likes to read. he read 6 books when he was 6 years old. every year he doubled the number of books he read the previous year. how many total books did he read between the ages of 6 and 10? a. 60 b. 90 c.186 d.187

What is the number 321,000,000 in scientific notation? also what is the number? ?