A small plane flew 517.5 miles in 2.5 hours with the wind. Then on the return trip, flying against the wind, it traveled only 287.5 miles in 2.5 hours. What were the wind velocity and the speed of the plane? (Note: The "speed of the plane" means how fast the plane would be flying with no wind.)

What is the sum of these mixed numbers 2 1/8 + 4 3/8

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

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.