If y varies directly as x, and y= 14 when x = 5, what is y when x = -5

Write a polynomial that fits the description: a third-degree polynomial with leading coefficient -4

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

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.