What is the vertex of 2x^2 - 4x + 7

When can u say there is no solution for a system of linear inequalities? explain your answer and show with a system and graph

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane