Find the circumference of each circle from the given radius or diameter

Please help

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.

In austin texas 8 bats ate 40 grams of insects in one night at this rate how many grams of insects could 64 bats eat in one night

Astudy found that the variance in the number of vehicles owned or leased by subscribers to a magazine is .094. assume a sample of 12 subscribers to another magazine provided the following data on the number of vehicles owned or leased: 1,1,1,0,3,2,1,1,2,1,0, and 1 a) compute the sample variance in the number of vehicles owned or leased by the subscribers (to 4 decimals). b)test the hypothesis to determine whether the variance in the number of vehicles owned or leased by subscribers of the other magazine differs from .calculate the value of the test statistic (to 3 decimals).