What is the completely factored form of p^4 – 16?

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

How do i put 3(x+7) in distributive property