What is the perimeter of a semicircle with a diamiter of 4

2pi or approximately 6.28

Step-by-step explanation:

The perimeter of a circle is called the circumference

A semicircle is 1/2 of the circle so we want 1/2 of the circumference

1/2 C = 1/2 pi*d  where d is the diameter

        = 1/2 pi *4

         =2pi

We can approximate pi by 3.14

         = 2(3.14) = 6.28

c 1 hour

step-by-step explanation:

m = 2e

m = 2 so 2 = 2e

1 = e

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;