A circular flower bed is 21 m in diameter and has a circular sidewalk around it that is 4 m wide find the area of the sidewalk in square meters use 3.14 for pi

The contents of 3838 cans of coke have a mean of x¯¯¯=12.15x¯=12.15. assume the contents of cans of coke have a normal distribution with standard deviation of σ=0.12.σ=0.12. find the value of the test statistic zz for the claim that the population mean is μ=12.μ=12.

Having a hard time understanding this question (see attachment).

Point r divides in the ratio 1 : 5. if the coordinates of e and f are (4, 8) and (11, 4), respectively, what are the coordinates of r to two decimal places?