David spent four hours babysitting. He charges $24 upfront and then an additional charge per hour. The total amount he earned can be represented by the expression $4x + $24. What expression represents the amount he earns each hour? IRCLE KEY NUMBERS $4x + $24

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.