Gabrielle is 8 years older than Mikhail. The sum of their ages is 58. What is Mikhail's age?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

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%