Does the Bible have an answer for every question?
The Bible may not have a specific answer for every question, but it does give us the general principles to diagnose and understand the answers to our questions from God's perspective. While it may not tell us specifically that 1+1=2, it does say that we should seek out the truth, that God cannot and does not make errors. It also supports the principle of general revelation, which refers to a universal aspect of God, as well as his complete knowledge of spiritual and natural matters such as the proper observation of nature and the universe, philosophy, reasoning, human conscience, and providence.
In essence, the Bible does have an answer for every question - at least in a general way. The difficult part is accessing which biblical principle to apply to any given question.
For Further Study:Making Biblical Decisions, by Dr. John Frame.
Theological Editor of Third Millennium Ministries, (IIIM)