Answer:
C.NASA
Explanation:
Katherine Johnson works at the Langley Research Center in Hampton, Virginia in 1961, alongside her colleagues Mary Jackson and Dorothy Vaughan. All of them are African-American women; the unit is segregated by race and sex.
To make America economically independent from other countries.
Answer: 29 rulers
Detailed Explanation:
Rome had 29 different rulers between A.D. 180 and A.D. 284.