can someone please go answer my previous question that i asked. I really need help with it. its also worth 100 points IF you answer CORRECTLY. so please go answer it. thanks!

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

What is the value of x when x + 7 = 21?