Both Questions $(5$ pts $)$ let $a,b$ and $c$ be vectors in $R^3.$ Identify whether each of the following expressions yields a scalar, a vector or is undefined.$("+"$ represents the vector addition,"." represents the dot product and $""$ represents the cross product.$)$

$(3)$ Does the point $A=(3,4,-1)$ lies on the surface $2x-3y+5z=0?$ What about the point $B=(3,2,0)?.$ You need to show your work to get the full credit.