Can someone please answer ASAP. I only had 3 minutes to answer this question ‍♀️. (No FAKE LINKS!!)

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

Asquare has a perimeter of sixteen centimeters. what is the length of each of its sides? a. 8 cm c. 9 cm b. 4 cm d. 10 cm select the best answer from the choices

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?