What additional information is needed to prove that the triangles are similar? to prove def ~ jkl by sas, we would need to show that de/jk = . to prove def ~ jkl by aa, we would need to show that angle e ≅ or that angle f ≅ .

x=half

step-by-step explanation:

step-by-step :

thats not a system of equations, that is a solution

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -