In 1939, what event provided young Carl Sagan with a vision of the future that was powerful enough to inspire him and others to follow their dreams?

The World of Tomorrow

Explanation:

In 1939, the event that provided young Carl Sagan with a vision of the future that was powerful enough to inspire him and others to follow their dreams is known as "The World of Tomorrow." It was held in New York. The event displayed a seven-foot-tall robot, air conditioners, and a speech synthesizer.

Carl Sagan would later become an astronomer and astrophysicist. He was known for his creation of the Pioneer plaque and the Voyager Golden Record, an expansive information that is expected to be comprehended by any extraterrestrial intelligence outside the earth.

8 - (2a + 7) = a + 40     distribute/multiply - into (2a + 7)

8 - 2a - 7 = a + 40

1 - 2a = a + 40       add 2a on both sides

1 = 3a + 40         subtract 40 on both sides

-39 = 3a       divide 3 on both sides

-13 = a

[proof]

8 - (2a + 7) = a + 40

8 - (2(-13) + 7) = -13 + 40

8 - (-26 + 7) = 27

8 - (-19) = 27

8 + 19 = 27

27 = 27