What is a rational number that isn't an integer?

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

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.