Thus is my last test question I promise

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

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.