Need ! the equation of a parabola is y=1/4x^2−2x+1 .
what is the equation of the directrix?
1. y = 1
2. y= −2
3. y= −3
4. y= −4

Which of the following statement about pascal's triangle are true?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? why? a. the z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. b. the z score of 0 is most preferable because it corresponds to a test score equal to the mean. c. the z score of minus2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. d. the z score of minus1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average