A school is building a rectangular garden. The school only has enough money to buy 20 feet of fencing to enclose the garden. The area of the garden is represented by the function
A(z)
-2x² + 20%
where x is the width in feet.

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).

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible