To Inquire
transitive verb, ichidan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The first kanji is question. And you learned 合わせる is "to join together." What's "to join questions together"? It's to inquire. When you inquire, you ask all your questions together, right?
You know how to read 合わせる already, so here's a mnemonic to help you remember the reading of 問:
You love to inquire with your toes (と). By that, you mean you love to type on your keyboard with your toes. There's no particular reason for this besides that you like the feel on your toes when you type up an inquiry.
メーカーに問い合わせるよ。
I'll contact the manufacturer.
メールで問い合わせてみたら？
Why don't you try sending an inquiry by email?
事前に問い合わせたかったんだけど、電話がつながらなかったんだよね。
I wanted to inquire in advance, but I couldn't get through on the phone.