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Answer:
8x + 3
Step-by-step explanation:
Given
2(5x - 1) - (2x - 5)
Distribute first parenthesis by 2 and second by - 1
= 10x - 2 - 2x + 5 ← collect like terms
= 8x + 3
This is an isosceles right triangle (AB = BC & ∠ B=90° - Given)
Then the angles at the base are equal and ∠ CAB = ∠ ACB = 45°
Theorem: Segment DE, joining the midpoints of 2 sides is:
1st) parallel to the 3rd side and
2nd) equal to half the measurement of the 3rd side
So if the 3rd side (hypotenuse) = 9 units, DE = 9/2 = 4.5 units