Which equation is true? A) (12 + 17) - 9 = (23 -7) + 4
B) 12+ (17 -9) = 23 - (7 + 4)
C) ( 12+ 17) - 9 = 23 - ( 7+4)
D) 2+ (17 - 9) = 23 - (7+4)

Step-by-step explan

B. because you can take 17 from nine

A

Step-by-step explanation:

B C and D are false Hoped this helps

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 correct answer is 5 6 and 7