Can anyone help me to verify idetities :20,22,23,24

Describe the symmetry of the figure. identify lines of symmetry, if any. find the angle and the order of any rotational symmetry.

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

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