506,709 in expanded form

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

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

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels