Answer: r=6.5
Step-by-step explanation:
-2r = -13
r = 13/2
r = 6.5
The minimum number of socks that she needs to get such that a pair is always formed is 5.
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How many socks must she get to be ensured of having a pair?</h3>
We know that she has:
- 10 white socks.
- 10 black socks
- 10 brown socks
- 10 blue socks.
First, we need to compute the maximum number of socks she needs to take in such a case that no pair is formed.
That will be 4, and represents the case where:
1 white sock, 1 black sock, 1 brown sock, and 1 blue sock are drawn. At that point, no pairs are formed.
Now, if she draws another sock, a pair will always be formed.
From this, we conclude that if she draws 5 socks, always at least one pair will be formed.
If you want to learn more about combinations, you can read:
brainly.com/question/11732255
Answer:
8 arrangements
Step-by-step explanation:
The highest common factor of 24 and 40 is 8
So
40 / 8 = 5
24 / 8 = 3
5 orchids and 3 lilies per arrangement makes 8 arrangements
Answer:
x = -8
Step-by-step explanation:
x + (8/4) = -6
x × 4 + (8/4) × 4 = -6 × 4
4x + 8 = -24
4x = -24 - 8
4x = -32
x = -8