Can someone please answer this question please answer it correctly and please show work please help me I need it

A

Step-by-step explanation:

Lets find the values:

Gained 2.2 kg = 2.2

Lost 1.5 kg = (-1.5)

Lost 3.7 kg = (-3.7)

Adding these would be represented by the equation:

2.2 + (-1.5) + (-3.7) = ?

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.