What’s the correct answer for this question?

Mathematics

1 answer:

pav-90 [236]3 years ago

5 0

Answer: choice C

Step-by-step explanation:

The union of events A and B, denoted ∪ , is the collection of all outcomes that are elements of one or the other of the sets A and B, or of both of them. It corresponds to combining descriptions of the two events using the word “or.”

**keep in mind that we don’t write numbers more than once in these sets(choiceB)

so the answer would be

{3,4,5,6,7,8,9}

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Last year, the hiking club had 25 members. This year, there’s 37. What is the percent increase?

borishaifa [10]

Answer:

The hiking club's member count increased by 48%.

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We are given two data values: 25 members and 37 members. We need to determine how many members the club gained first. We can set up an equation where we solve for an unknown, or<em> x</em>, in this case.

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Mashutka [201]

9514 1404 393

Answer:

a) (-5±√10)/3 ≈ {-2.721, -0.613}

b) (6±√21)/5 ≈ {0.283, 2.117}

Step-by-step explanation:

a) The relevant coefficients are ...

a = 3, b = 10, c = 5

$x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\x=\dfrac{-10\pm\sqrt{10^2-4\cdot3\cdot5}}{2\cdot3}=\dfrac{-10\pm\sqrt{40}}{6}\\\\\boxed{x=\dfrac{-5\pm\sqrt{10}}{3}\approx\{-2.721, -0.613\}}$