If the bird were just guessing there would be two options (right or wrong) and we would expect them to be equally likely to occur (50% chance for each). A 50% of correct, out of 12 cards gives us:
12×0.50=6
If the bird was guessing we would expect 6 correct answers. (1/2 of the total correct and 1/2 wrong.)
So the answer would be 6.
3/5 = ?/300
We multiply 5 by 60 to get 300
So you do the same to 3
3x60= 180
180
Answer:
![\displaystyle \textcolor{black}{4.}\:[-3, -5]](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Ctextcolor%7Bblack%7D%7B4.%7D%5C%3A%5B-3%2C%20-5%5D)
![\displaystyle \textcolor{black}{3.}\:[8, -1]](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Ctextcolor%7Bblack%7D%7B3.%7D%5C%3A%5B8%2C%20-1%5D)
![\displaystyle \textcolor{black}{2.}\:[4, -7]](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Ctextcolor%7Bblack%7D%7B2.%7D%5C%3A%5B4%2C%20-7%5D)
![\displaystyle \textcolor{black}{1.}\:[3, -2]](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Ctextcolor%7Bblack%7D%7B1.%7D%5C%3A%5B3%2C%20-2%5D)
Step-by-step explanation:
When using the Elimination method, you eradicate one pair of variables so they are set to zero. It does not matter which pair is selected:

{2x - 3y = 9
{⅖[−5x - 3y = 30]

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{x - 2y = 10
{⅔[x + 3y = 5]

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{y = −3x + 5
{−⅜[y = −8x + 25]

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{y = −x + 1
{¼[y = 4x - 14]

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Answer: 99% Confidence interval = 6.97, 8.706
Step-by-step explanation: Please find the attached document for the step by step explanation