1:00 to 2:15 is 1 hour and 15 minutes.
In that time the duck went from 50 to 125, which is a 75 degree increase.
75 degrees / 75 minutes = 1 degree per minute increase.
175 degrees - 125 degrees = 50 degree more it needs.
1 degree per minute x 50 degrees = 50 more minutes.
50 minutes after 2:15, would be 3:05
It will be 175 degrees at 3:05
Let O be the point of intersection of diagonals.
Consider triangles FOE and EOD:
FO = OD, ∠FOE = ∠EOD and OE is a common side ⇒
triangles FOE and EOD are congruent.
In congruent triangles all corresponding sides and are congruent ⇒
EF = DE = 6
Answer: 
<u>Step-by-step explanation:</u>
When you subtract b/2a from both sides, you end up with the Quadratic Formula.
