I need help with number 6, please, thank you

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

(mc 02.03) what set of reflections and rotations would carry rectangle abcd onto itself? reflect over the y-axis, reflect over the x-axis, rotate 180° rotate 180°, reflect over the x-axis, reflect over the line y=x reflect over the x-axis, rotate 180°, reflect over the x-axis rotate 180, reflect over the y-axis, reflect over the line y=x