A ball is dropped from a height of 20 ft. Each time it bounces to 70% of the previous height. What is the total vertical distance the ball has traveled when it hits the ground for the 8th time? (answer to 2 decimal places)

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

What statement is true? 2x^2-9x+2=-1

Nikolas calculated the volume of the prism. his work is shown below.