If using the method of completing the square to solve the quadratic equation x2 – 19x-39 = 0, which number would have to be added to "complete the
square"?

Acircle has a circumference of 28.36 units what is the diameter of the circle

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.