Evaluate 1/3m - 1 1/2n when m = 21 and n = 12

-11

Step-by-step explanation:

1/3(21)(m is 21)

1 1/2(12)(n is 12)

1/3(21)-1 1/2(12)

7-3/2(12)

7-18

-11

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.

1 3 5

step-by-step explanation:

i took the test: )