In hidden figures what is the initial problem with cascade aerodynamics and what stops the concerns?

ok do the correct answer is idk vgfhsbv #fu

there are number of topics. you can pick any one of these topics:

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.

the noun in this is person