What is -3 to the second power as an exponent?

Write 5 numbers that round to 740 when rounded to the nearest 10

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).

Which value is not a solution of 8x^3 – 1 = 0