In rectangle abcd, if the coordinates of a are (0, 0) and of c are (r, s), find the coordinates of b and d.

The system of equations graphed below has how many solutions?

15 point ! ~ see if you know the answer to both you!

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).