The temperature went from -12°f to18°f. which of the following expressions could be used to find how much the temperature changed?
-12 - 18
18 - (-12)
-12 + 18
18 + (-12)

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

Find the missing variable for a parallelogram: a = latex: 28in^2 28 i n 2 h = b = 6.3 in (1in=2.54cm)

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.