In parallelogram lmno, lm = 4.12, mn = 4, ln = 5, and om = 6.4. diagonals and intersect at point r. what is the length of or?
a.2
b.2.06
c.2.5
d.3.2
e.12.8

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: