Question: Solve for x: 2/5(x - 4) = 2x

answers:

1
2
0 -1
O1
0-8

x = - 1

Step-by-step explanation:

Given

(x - 4) = 2x ( multiply both sides by 5 to clear the fraction )

2(x - 4) = 10x

2x - 8 = 10x ( subtract 2x from both sides )

- 8 = 8x ( divide both sides by 8 )

- 1 = x

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;