exam Maths Puzzle Numerical Ability

Use three or more sentences to describe how you would solve the following equation using the quadratic formula. 2x2-13x-7=0

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Write in slope-intercept form the equation of the line passing through (1,3) and (-5,-1). Show that this line is perpendicular to the line y=-3/2x+17. thanks I need your help. How many committees can be selected from a group of 30? how does the number change if the first person selected must be the chair person?