Khan academy (8th grade math ) ,

k=37

Step-by-step explanation:

If we plug in 2 for t, which it tells us is the input, then the output of the problem will be 37

k=13t-2

Plug in the value for t.

k=13(2)-2

k=39-2

k=37

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation:

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;