Perform the sequence of row operations on the matrix. What did the operations accomplish? Show all work. 
(a) Add -4 times R1 to R2.
(b) Add -4 times R1 to R3.
(c) Add 2 times R2 to R3.
(d) Add 1 times R2 to R1.
Definitions:
Erectile Dysfunction
A condition characterized by the inability to maintain an erection sufficient for satisfactory sexual performance.
Synarthroses Joints
Immovable joints in the body where two bones are closely joined, allowing minimal to no movement.
Immovable
Incapable of being moved or altered in position or state.
Osteoporosis
A medical condition in which the bones become brittle and fragile from loss of tissue.
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