The one you used is correct.
The correct spelling is "knowledgeable" about the "changeable."
The correct spelling is changeable (liable to change).*Changeable and knowledgeable oddly keep their ending E's, complicating pronunciation.
That is the correct spelling of estar, the Spanish verb "to be" (to be at the present time, as in something changeable).
The misspelled word is "changable." The correct spelling is "changeable."
That is the correct spelling of "changeable" (subject to alteration or revision). The nouns ending in -ge or -ce usually keep the E when adding the suffix -able.
The correct spelling is privileges.The correct spelling is privileges.The correct spelling is privileges.The correct spelling is privileges.The correct spelling is privileges.The correct spelling is privileges.The correct spelling is privileges.The correct spelling is privileges.The correct spelling is privileges.The correct spelling is privileges.The correct spelling is privileges.
No, "VAXINATE" is not a correct spelling. The correct spelling is "VACCINATE."
No, the correct spelling isopportunities.
The spelling employees is correct.
Opened is the correct spelling.
The correct spelling isfistulagram.
Knob is the correct spelling.