This maybe primary but i don't get it
There's a circle with the radius = 3, calculate it's perimeter

Find parametric equations for the line tangent to the curve of intersection of the surfaces at the given point. surfaces: xsquared2plus+2yplus+2zequals=1212 yequals=33 point: left parenthesis 1 comma 3 comma five halves right parenthesis

Aline that intersects one of two parallel lines intersects the other also always sometimes never

The suare root of 9x plus 7 plus the square rot of 2x equall to 7