Answer:
- Side Side Side congruence criteria
Step-by-step explanation:
As per diagram, the triangles have 3 congruent sides:
So they are congruent by SSS criteria
I believe that Noah’s number 15.
19 - 15 = 4
4 * 4 = 16
-16t^2+400=0
16t^2=400
take square root on both sides.

4t=20
t=20/4
t=5
30:45
6:9
10:15
I believe that’s it,
hope this helps