Find the value of k for which the equation x² + k(2x + k – 1) + 2 = 0 has real and equal roots.

The heaviest 16% of all men in weight weigh more than how many pounds ?

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

Consider circle c with angle acb measuring 3/4 radians. if minor arc ab measures 9 inches, what is the length of the radius of circle c? if necessary, round your answer to the nearest inch.