What is the value of b2 - 4ac for the following equation? 2x 2 - 2x - 1 = 0

Hiroki wrote a number that is the opposite of -3. what number did hiroki write? a. ⅓ b. 3 c. 0 d. -3

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.