10. Identify the lines that are perpendicular. y = 4; y=-3x-4;x = -6;y + 5 = 2(x + 2)

a. X-4 and y + 5 = 2(x + 2) are
perpendicular.

b. y = 4 and x = -6 are perpendicular;
- 4 and y + 5 = 2(x + 2) are
perpendicular.

c. none of these lines are perpendicular

d. y = 4 and x = -6 are perpendicular.
y = -1/2 x

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.