"reply affirmatively" is a correct and usable phrase in written English.
It is usually used when the speaker wants the listener to respond positively to something that has been said or asked. For example, "Will you help me with this project?" "Please reply affirmatively if you are able to assist."
Husserl, Russell, Vendler and Hossack (Husserl 1900 1901), Russell, Vendler 1967, 1972, Hossack 2007) reply affirmatively to one of these questions; thus Russell at one point argues that a perception has a single object, such as "knife-to-left-of-book", an entity he first called a "complex" and then "a fact" (Russell ONTF).
This dichotomous variable was measured by taking value 1 if the respondent reply affirmatively to the question, "Are you, alone or with others, expecting to start a new business, including any type of self-employment, within the next three years?", and 0 otherwise.
As mentioned before, scientists were less likely to reply affirmatively to questions using the words "fabrication" and "falsification" rather than "alteration" or "modification".
In Italy, when voters are asked if the country would be better off outside the euro, most Italians usually reply affirmatively.
The witness replies affirmatively.
The Ambassador replied affirmatively, noting that the USG has shared such information with GOP intelligence agencies.
Mr. Anderson later asked whether she had solicited contributions from anyone, and she replied affirmatively, citing friends and relatives.
Tarui asked if the U.S. was prepared to accept the Algerian proposal, to which A/S Gottemoeller replied affirmatively.
"I asked him whether this asset was floating," Mr. Pomerantz said, and when the man replied affirmatively, Mr. Pomerantz said, "Oh, well, you're calling about the yacht".
Yet, when queried before the game as to whether he could overcome the five-time Wimbledon finalist, Kyrgios replied affirmatively "with the matter-of-factness of someone being asked if they would like sugar in their coffee".
We sent invitations to 12 organisations of consumers in developed countries, and 5 replied affirmatively.
