'Pray' in the Bible

Judge for yourselves: Is it proper for a woman to pray to God with her head uncovered?

So then, one who speaks in a tongue should pray that he may interpret.

If I pray in a tongue, my spirit prays, but my mind is unproductive.

What should I do? I will pray with my spirit, but I will also pray with my mind. I will sing praises with my spirit, but I will also sing praises with my mind.