答
dá
One arrow flying back: 答 for replies, answers, and yes
The picture A question flies in and lands on you, and you send something back along the same line. 答 sends something back; 问 is the one that throws it out first.
Where the picture shows up in 答
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voice going back
老师问了，他站起来回答。
lǎo shī wèn le, tā zhàn qǐ lái huí dá
The teacher asked, and he stood up and answered.
A question lands on him, he rises from his chair and sends his voice back toward the teacher
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pencil going back
这道题我答错了。
zhè dào tí wǒ dá cuò le
I got this question wrong.
A hand filling a blank on a test sheet, pushing characters back toward the printed question
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nothing going back
我发了微信，他一直不答。
wǒ fā le wēi xìn, tā yì zhí bù dá
I sent a message and he still has not replied.
A sent bubble on a phone screen with empty space under it and nothing coming back
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a yes going back
他答应帮我搬东西。
tā dā yìng bāng wǒ bān dōng xi
He agreed to help me move my things.
Seeing the asking hand, he nods and sends a yes back across the table
答应 is read dā yìng
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the thing that came back
这个问题的答案很简单。
zhè ge wèn tí de dá àn hěn jiǎn dān
The answer to this question is very simple.
The returned words settled onto the paper as one short line
All of it in one picture
答 is a single arrow pointing back the way it came. Send your voice back and it is a reply; send pencil marks into the blank on a test and it is answering the question. Send nothing back and there is no answer at all, while nodding a yes back to a request is agreeing. Whatever came back and sat down is the 答案, the answer itself.