How many groups of 100 pennies are in 1000 pennies

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 area of the regular hexagon if a side is 20 cm.

Which of the following is the shape of a cross section of the figure shown below