How many solutions does this quadratic equation have ? y=x^2-8x-20

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4