2. Realiza la siguientes sumas de números enteros usando el método de tener y deber a) –4 + 5 –3 =

b ) +3 –5 +7 =

c) –3 + 5 –8 =

d) +4 – 7 –8 = 9.

Angel entered a triathlon (a three-part race). he swam 1 mile, rode his bike 30 miles, and ran 10 miles. how far did he go altogether? a. 11 miles b. 123 miles c. 41 miles d. 40 miles

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

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.