Airplane a travels 1400 km at a certain speed. plane b travels 1000 km at a speed 50 km divided by h faster than plane a in 3 hrs less time. find the speed of each plane.

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

Which of the following statements is true about women and minorities in early psychology? a. in the early 20th century, numerous graduate schools recruited women and minorities to study psychology. b. opportunities in higher education were limited for women and minorities in the early 20th century due to discrimination. c. despite some obstacles, there were numerous employment opportunities for women and minorities. d. women and minorities were often selected to do academic research in an effort to make the field more diverse.

Which notation is used to represent an alpha particle? a. b. c. d.