Answer! highly 20 points!
the temperature on a summer afternoon is 84°f. define a variable and write an expression to find the temperature after it changes. then evaluate your expression for a decrease of 14 degrees fahrenheit.
14 – c; 14 – (–84) = 70; 70°f
84 + c; 84 + (–14) = 70; 70°f
14 + c; 14 + (–84) = 98; 98°f
84 – c; 84 – (–14) = 98; 98°f

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

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.

If rs 900 amounts to rs 1044 in 4 years, what sum will amount to 1368 in 3 1/2 years at the same rate