Pls can you help with number 5 and 6

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

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.