For what value of k makes the expression a perfect square trinomial? 9x^2+30x+k I need this quick

The heaviest 16% of all men in weight weigh more than how many pounds ?

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t

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%