Help me and no links please that’s annoying

For the equations below which statement is true ? -2x=14 6x=-42

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x

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.