GRAPHS AND FUNCTIONS Inverse functions: Cubic, cube root The one-to-one function fis defined below. f()(x+9) -1 Find f (x), wheref is the inverse of f. '() ? 미미 x

What kind of variable is x in terms of linear regression? *   a) Independent   b) Dependent   c) Both of the above   d) None of the above

What are the assumptions underlying the predator-prey model discussedin this section?

Baby walkers are seats hanging from frames that allow babies to sit upright withtheir legs dangling and feet touching the floor. Walkers have wheels on their legsthat allow the infant to propel the walker around the house long before he or she canwalk or even crawl. Typically, babies use walkers between the ages of 4 months and11 months.Because more walkers have tray table in front that block babies’ view of their feet,child psychologists have begun to questions whether walkers affect infants’cognitive development. One study compared mental skills of a random a=sample fothose who used walkers with a random sample of those who never used walkers.Mental skill scores averaged 113 for 54 babies who used walkers (standard deviationof 12) and 123 for 55 babies who did not use walkers (standard deviation of 15). (A) Is there evidence that the mean mental skill score of babis who use walkers is different from the mean mental skill score of babies who do not use walkers? Explain your Answer.