Give the domain of t(x) = V-1- x in interval notation. (-0,1) Hint: Remember that, when we are working with real numbers, the number in an even root must be non- negative (i.e. > 0)

x^2-x-12=>0 solve ineq

I don't get how they got the number to graph on the x-axis

A batsman played with an average of 78 runs per match in first 28 matches. In the next 14 matches, he scored runs win an average of "x" runs per match so that his overall average becomes 80 runs per match. Find the value of “x”.