Soit a+b=-6,2 calculer
e=(a+4,5)-(-b-1,7)
f=12-(a-4)+(3-b)

e=0

f=25,2

Step-by-step explanation:

e=a+4,5+b+1,7

= (a+b)+4,5+1,7

= -6,2+6.2

= 0

f=12-a+4+3-b

= -(a+b)+19

= 6,2+19

= 25,2

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.

the answer is 45 i just did it on oddesy ware