Answer:
B. 2x – 1 = 13 and x = 7
Step-by-step explanation:
We are given 4 equations and a solution for each. We have to tell which of the given solution satisfies the given equation.
Option A.
2x -1 = 13 and x = 6
Using this value in the equation, we get:
2(6) -1 = 13
12 - 1 = 13
11 = 13, which is not true. Hence this option is not valid
Option B.
2x - 1 = 13 and x = 7
Using the value in the equation, we get:
2(7) - 1 =13
14 - 1 =13
13 = 13, which is true. Hence this option is valid.
Option C.
2x + 1 =13 and x = 7
Using the value in the equation, we get:
2(7) + 1 = 13
15 = 13, which is not true. So this option is not valid
Option D.
2x - 1 = 13 and x = 11
Using this value in the equation, we get:
2(11) - 1 = 13
21 = 13, which is not true. Hence this option is not valid.
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Answer:
P(select green sock) = 1/8
Step-by-step explanation:
If the probability of selecting a white sock is 1/4, then we know there are 2 white socks: 1/4 has the same value as 2 out of 8.
Similarly, we can determine the number of yellow socks: 5/8 is equivalent to 5 out of 8.
Thus, 2 socks are white; 5 are yellow; and the last (the 8th) sock is green.
P(select green sock) = 1/8