Given that the area of rectangle defc is 90 square units. calculate the area of triangle abc. explain your work.

Rewrite the following without an exponent. (5/8)-1

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).

What is the product? a-3/15a × 5/a-3