Find the discriminant and the number of real roots for x^2+2x+8=0

Which letters from the table represent like terms? a and b b and c a and d b and d

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample