The value of y varies directly with x and inversely with the square ofz . When the value of x = 24, and y = 6, z= 8. Find the value of x when y= 20 and z= 6.

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

Hi, can anyone show me how to do this problem? 100 points for this. in advance

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%