(1 point) The distribution of heights of adult men in the U.S. is approximately normal with mean 69 inches and standarddeviation
2.5 inches. Use what you know about a normal distribution and the Empirical rule to answer the following.NOTE: If your answer is a percent, such as 25 percent, enter: "25 PERCENT" (without the quotes). If your answer is in inches,such as 10 inches, enter: "10 INCHES" (without the quotes and with a space between the number and the INCHES). If youranswer is an interval, such as 14 to 15 inches, then enter: "14 TO 15 INCHES" (without the quotes). Do not use extra zerosand do not include a decimal point unless your answer is not a whole number. Your answer must be entered in the correctformat.a) Between what approximate heights do the middle 95 percent of men fall?Answer:
1 answer:
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( + 4)(
- 4)
To solve this question you must FOIL (First, Outside, Inside, Last) like so
First:
(x^2 + 4)(x^2 - 4)
x^2 * x^2
x^4
Outside:
(x^2 + 4)(x^2 - 4)
x^2 * -4
-4x^2
Inside:
(x^2 + 4)(x^2 - 4)
4 * x^2
4x^2
Last:
(x^2 + 4)(x^2 - 4)
4 * -4
-16
Now combine all the products of the FOIL together like so...
x^4 - 4x^2 +4x^2 - 16
Combine like terms:
x^4 - 4x^2 +4x^2 - 16
- 4x^2 +4x^2 = 0
x^4 - 16 <<<This is your answer
Hope this helped!
~Just a girl in love with Shawn Mendes