Darla is able to drive her car 37.5 miles per gallon of gasoline. Write the answer of the minimum number of gallons of gasoline Darla would need
to drive 120 miles to her brother's house.
Please help me.

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

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 roots of the equation below. x^2 - 6 + 9 = 0