What is X^2+16y=0 written in standard form

Find the values of y: 3y^3(y^2+ 2/3y)=0

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?