5 divided by 4/9 plzzz help its for khan

If a =6, what is the value of 2a(3b + 5c)?

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).

Two parallel lines are crossed by a transversal. what is the value of x? x = 40 x = 70 x = 110 x = 130