Answer:
You have to eliminate one of the variables when the equations are added.
A) x + 2y + z = 10
B) 2x -y +3z = -5
C) 2x -3y -5z = 27
We mulutiply A) by 2 then add it to B and C
A) 2x + 4y + 2z = 20 and the sum =
6x = 42 Luckily, the "y" and "z" variables cancel out and we find:
x = 7
Then we use x =7 in calcucating equation A) and B)
A) 2y + z = 3
B) -y + 3z = -19
THEN solve for y and z by eliminating variables.
Step-by-step explanation:
The answer is 40% I think
For example, let's say b=30. If you divide 30 by 10, you get 3(obviously). But if you divide 10 into 30, you get -3.
Answer:
B
Step-by-step explanation:
What is required is the probability of selecting one orange and one black kitten.
outcomes ( 1 O and 1B) = 4C1 * 5C1
Total outcomes = 9C2
Note: the order of color does not matter it is simply a matter of selection hence only combinations are made NOT permutations.
P (1O and 1B) = outcomes ( 1 O and 1B) / Total outcomes
P (1O and 1B) = (4C1 * 5C4) / 9C2 = 0.5556
Answer:
a. Identify the population of interest in this study.
- all the population of the country
b. Identify the sample for the study.
- 50 adults (the ones that were surveyed)
c. Identify the parameter of interest in the study.
- the parameter of interest is the people that believe that coffee shops are overpriced
d. Find and interpret a 95% confidence interval for the parameter of interest.
z score for a 95% confidence level = 1.96
margin of error (E) = z score x √{[0.4(1 - 0.4)] / 50} = 1.96 x 0.069282 = 0.13579
95% confidence level interval:
0.4 - 0.13579 = 0.26421
0.4 + 0.13579 = 0.53579
- 95% confidence interval (0.26421 , 0.53579)
