In a geometric progression, the third term is 16 and the fifth term is 4.calculate (i)the first term and the common ratio,(ii) the tenth term,(iii) the sum to infinity

What is the quotient of 42/3 divided by 4 1/5

Negative 5 1/12 + negative 4 1/4 + 6 3/4

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%