3 is positive because it is more than 0. Anything more than zero is positive.
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I helped you through the steps as well don't worry! :D
Answer: There were 741 books in the library a year later.
Step-by-step explanation:
Given: Total books in library = 570
Number of books increased by 30%.
One year later, Number of books in the library = (Total books in library) + 30% x (Total books in library)
= 570 + (0.30) x (570)
= 570 (1+0.30)
= 570 (1.30)
= 741
Hence, there were 741 books in the library a year later.
Answer:
Object will be at a distance of 358098.6 km from the source
Step-by-step explanation:
We have given angle = 0.0008 degree 
Radius is given = 2.50 km
Linear size of the object will be equal to diameter
So linear size = 2.5×2 = 5 km
We know that linear size 
So 
d = 358098.6 km