Let H denote span −1 1 −1 −2 −4 3 −2 −4 { [ −3 ],[ 2 ],[ −1 ],[ −2 ] } −1 1 −2 −4 −7 5 −3 −6Find the dimension of H and determine a basis.

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte