4.

Did God give the prophets of the Bible the ability to do obvious miracles as a confirmation that they were sent by God?

Bible: Yes Qur'an: Yes

Exodus 10:2 – Tell in the ears of thy son… my signs which I have done among them; that ye may know that I am the LORD.

John 14:11 – beleive me for the very works' sake.

Hebrews 2:4 – God also bearing them witness, both with signs and wonders, and with diverse miracles and gifts of the Holy Spirit...

Al-Baqarah 2:92 – Moses came to you with clear signs.

Ali 'Imran 3:49 – By Allah’s leave I shall give sight to the blind, heal the leper, and raise the dead to life... Surely that will be a sign for you, if you are believers.

Ali 'Imran 3:183 – Say (to them, O Muhammad): “Messengers came to you before me... who came with miracles, and with the Psalms, and with the Scripture giving light.