Question

read the text. before computers were widely used, nasa hired human \computers.\ computers performed complex calculations needed to send astronauts into space. katherine g. johnson was one of nasas most successful computers. when nasa was preparing to send alan shepard into space, engineers needed to predict the trajectory, or path, his capsule would take. johnson helped by calculating the trajectory. by 1962, nasa had started using electronic computers; these determined the trajectory for john glenns friendship 7 mission. the trouble was glenn didnt trust the machines and wanted johnson to do the job. johnson redid the calculations and made sure they were correct. by 1969, nasa faced its biggest challenge yet: the apollo 11 moon landing. once again, johnson responded by performing the calculations needed to match up the timing of the lunar lander with the command module. match the problems with their solutions. johnson figured out the trajectory. johnson helped match up the lander and the command unit. johnson double - checked the trajectory. problem solution nasa wanted to know where alan shepards capsule would land. john glenn didnt trust computers. apollo 11 needed to touch down on the moon.

Explanation:

1. For the problem of where Alan Shepard's capsule would land, Johnson figured out the trajectory as engineers needed to predict the path his capsule would take.
2. Since John Glenn didn't trust computers, Johnson double - checked the trajectory as Glenn wanted Johnson to do the job instead of the electronic computers.
3. When Apollo 11 needed to touch down on the moon, Johnson helped match up the lander and the command unit as she performed the calculations to match up the timing of the lunar lander with the command module.

Answer:

NASA wanted to know where Alan Shepard's capsule would land. - Johnson figured out the trajectory.
John Glenn didn't trust computers. - Johnson double - checked the trajectory.
Apollo 11 needed to touch down on the moon. - Johnson helped match up the lander and the command unit.