Question

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. problem john glenn didnt trust computers. nasa wanted to know where alan shepards capsule would land. apollo 11 needed to touch down on the moon. solution johnson figured out the trajectory. johnson double - checked the trajectory. johnson helped match up the lander and the command module.

Explanation:

Each problem is matched to the solution described in the accompanying text by identifying the corresponding action or need and its resolution.

Answer:

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