Lim x-> infinity of arctan(lnx)

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.