Aquadratic equation of the form 0=ax^2+bx+c has a discriminant value of -16. how many real number solutions does the equation have?

Adriveway is 40 yards long about how many meters long is it

Which one ? is the answer and how to find this answer

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days