A:(3,5) B:(7,10) determine the midpoint of AB

(5,7.5)

Step-by-step explanation:

Students should refer to the midpoint formula to find the midpoint of AB.

A (3,5)

B (7,10)

Midpoint formula: X₁ + X₂ / 2, Y₁+Y₂ / 2

Equation: 7+3 / 2, 10+5 /2

1/2= 2

17/2 = 7.5

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last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.