A brand new smartphone costs $1200. It decreases in value by 13.3% every year after its purchase. Which function models the value of the phone x years after its puchase? f(x)=0.867(1200)x

f(x)=1200(0.867)x

f(x)=1200(1.133)x

f(x)=1.133(1200)x

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The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

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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.