"tak" is an abbrevation for "tidak". Most of the time, "tak" is more likely to be used informally, while "tidak" is formal. "Tentukan" is not correct translation for 'check'. "Semak" is more suitable to be used in this translation. Last but not least, the applied translation used "yang betul" in the sentence but the words does not exist in the original text. So i decide to remove it from the translation.