The main issue of conflict between pope gregory vii and emperor henry iv was a. support of the franciscan order. b. lay investiture. c. the argument of whose authority was superior. d. refusing to accept younger sons of nobility into clerical orders. e. refusal to provide tithes to the church.

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explanation:

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69