How do you make a mix number out of 81 divided by 10?

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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%