Kennedy had the expression 3(2x-3x+8). She simplified and rewrote the expression 3(8+x). If any, what was her error?

It is -3x+24

Step-by-step explanation:

2x-3x is -x or -1x

It can also be simplified further using multiplication.

3(2x-3x+8)

3(-x+8)

-3x+24

hiking down a winding trail.

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;