What number produces a rational number when added to 0.5

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Explain why the two figures below are not similar. use complete sentences and provide evidence to support your explanation. (10 points) figure abcdef is shown. a is at negative 4, negative 2. b is at negative 3, 0. c is at negative 4, 2. d is at negative 1, 2. e

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.