Please give me the correct answer. Only answer if you're very good at math.​

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

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics

When is g(x) = 0 for the function g(x) = 5.23x + 4?