How many real number solutions does 4x^2+2x+5=0 have?

The length of each stair is 11 inches. what is the rise, r, for each stair? round to the nearest inch. 2 inches 7 inches 17 inches 24 inches

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .