What are the coordinates of the vertex of the parabola described by the equation below? y=7(x+5)^2-4

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms

:)i need to know on which ones are corresponding, alternate interior, alternate exterior, or none of these.

To start to solve the system of equations below, which number would you multiply in the equation -2x-5y=-1? the two equations are -2x-5y=-1 and 4x+2y=8