2 votes
2
0 votes
4
2 votes
5
If at every point of a certain curve, the slope of the tangent equals $\frac{-2x}{y}$ the curve isa straight linea parabolaa circlean ellipse
4 votes
6
The rank of the matrix given below is:$$\begin{bmatrix} 1 &4 &8 &7\\ 0 &0& 3 &0\\ 4 &2& 3 &1\\ 3 &12 &24 &21 \end{bmatrix}$$$3$$1$$2$$4$