Answer:
= 6.75 × 10^8
Step-by-step explanation:
Here's a graph of those terms.

Hope you could get an idea from here.
Doubt clarification - use comment section.
Answer:
Triangle DEF is not a right triangle ; possible lengths are 20 & 15
Step-by-step explanation:
For right triangle;
the sum of the square of the two adjacent sides must equal the square of the hypotenus.
Therefore, (6^2)+(11^2)≠(13^2).
the possible length are 20 & 15 because
(20^2)+(15^2)=(25^2)