Polynomial Practice. Can y’all help? And not just type in random letters to get points. Given f(x)=x^3-28x-48 has x=-4 as a zero, find the other zeros.

I’m guessing solving through Synthetic Division and Long Division.

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

Find the values of y: 3y^3(y^2+ 2/3y)=0

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?