Why would phospholipid heads in the cell membrane be hydrophilic? I know that makes inside and outsides of the cell membrane attracted to water, but according to google, it also means that the phospholipid heads "have a tendency to to mix with, dissolve in, or be wetted by water."

They have molecules that has a phosphate group on an end and it is called the head. The two-two fatty chain make the lipid tail. The phosphate is negative charged and makes the hydrophilic and head polar. And then the two head are attracted to water.

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.