Yuson must complete 30 hours of community service. she does 2 hours each day. what does the y intercept represent in this situation

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).

Twelve less than a number is at most 20

In the diagram below de and ed are tangent to 0 which expression gives the measure of def