Answer:
A) The sentence introduces readers to the paragraphs main idea.
Step-by-step explanation:
It does not talk about technology, it is not a new idea, and it is not saying anything negative.
C=180-A-B=180-69-40=71deg.
by sine rule
b/sinB=a/sinA
b=a/sinA*sinB
=15/sin(69)*sin(40)
= 10.33
c/sinC=a/sinA
c=a/sinA*sinC
=15/sin(69)*sin(71)
= 15.19
Not a conic section. No equation, I think
