If 400 bricks measuring 81" by 31" are required to build a wall 42 ft. high, how long is the wall?

Area of one brick = 6.75x2.58=17.44

Area of 400 bricks = 400x17.44=6975

Total brick area divided by 42' height of wall = 6975÷42=166.07 ft

The correct answer is 166 ft

Hope this helps!!!

<3 -austint1414

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;