Answer:
9/10
Step-by-step explanation:
2n+3=12n-6
3=12n-2n-6
3=10n-6
10n=3+6
10n=9
n=9/10
3x + (5+35x) = 3x -30
38x + 5 = 3x -30
38x = 3x -35
35x = -35
x = -1
Answer:
1. Area = Base * Height
2. 144x = 4x * 4x
3. 144x = 16(x^2)
4. 9x = x^2
5. x = 9
Step-by-step explanation:
In this item, we have the mean incubation period of 23 days and the standard deviation is 22 days. We use z-score to determine the unknown in each of the items.
(a) less than 21 days.
z-score = (23 - 21) / 22 = 1/11
This translates to a percentage of 53.6%
(b) z-score for 19 days.
z-score = (23 - 19) / 22 = 2/11
This translates to a percentage of 57.2%.
z-score for 23 days.
z-score = (23 - 23)/ 22 = 0
This translates to a percentage of 50%.
The difference between the two numbers is only 7.2%
(c) z-score of 25.
z-score = (23 - 25)/ 22 = -1/11
This translates to a percentage of 42.3%.
Then, subtract this value from 100 to give us the final answer of 57.2%.
Use distributive property a(b + c) = ab + ac.
