Compare the emergence of advanced civilizations in Meso and South America with the four early river valley civilizations. Which of the following systems of trade was most widely used in both ancient river civilizations and ancient Native American civilizations?

bartering
the exchange of coined money
free exchange
international trade

Use the knowledge of x- and y- intercepts to choose the correct graph of the equation 3x+6y=6

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)