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The phrase 'are needed to answer' is correct and usable in written English.
You can use it when you want to express that something is required to answer a question or solve a problem. Example: "Additional data and information are needed to answer our research question."
Exact(60)
While welcoming the findings, researchers said additional studies are needed to answer many questions.
Configurable products, like vehicles, face the challenge of handling all possible variants which are needed to answer the various customer needs.
In Victoria, Australia, as elsewhere, survivorship studies focusing on the AYA age group are needed to answer questions regarding their medical, psychological and social needs.
Accurate numerical models, which are often not available due to the difficulty of experimental testing under 1g-conditions, are needed to answer these questions.
For each research priority, I describe why it is important to our general understanding of acupuncture, what type of data or experiments are needed to answer these questions and what groups of acupuncturists can best answer these questions.
Additional studies are needed to answer these questions.
We expect that new technical tools are needed to answer this question.
Its optimality depends on which outputs are needed to answer the modeling question at issue.
Many authors conclude that prospective long-time studies are needed to answer the issues.
Further investigations are needed to answer this question.
Additional late phase clinical studies are needed to answer these questions.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com