Seth bought a TV on sale for $799. The original price was $979. What was the percent decrease? (Round to the nearest whole percent.)

18%

Step-by-step explanation:

Take:

$979-$799=180

$180divided by $979 multiply by 100%

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;

(5x-1)^2= (5x)^2-2(5x)×1+(1)^2=25x^2-10x+1