Sally traveled 80 miles by car on a country road and then 60 miles on a mountain road. she traveled twice as fast on the country road than she did on the mountain road. the total time of the trip was 4 hours. find the rate she drove on the mountain road.

The volume of a cube-shaped shipping container is 13,824 cubic inches. find the edge length of the shipping container.

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%