Agirl scout has (5x+18)
boxes of cookies and sells
(3x+12) of them. write an
expression to represent the
amount of boxes she has
left.

Step-by-step explanation:

(5x+18) - (3x+12)

5x+18=3x+12

5x-3x=2x

18-12=6

2x+6

The correlation r between the age of a car x , and the cars mileage, y is 0.768. this means that 76.8 % of the variation in mileage can be explained by the differences in the cars ages, 100 – 76.8 = 23.2% of the variation cannot be explained