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Solve the equation log, (3t+9) - log, 21 =1

Given: hf || jk; hg ? jg prove: fhg ? kjg to prove that the triangles are congruent by asa, which statement and reason could be used as part of the proof? fgh ? kgj because vertical angles are congruent. jkg ? hfg because vertical angles are congruent. fhg ? jkg because right angles are congruent. hfg ? kjg because alternate interior angles are congruent.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

This is about circle theorems. someone asap : (