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Goshia [24]
3 years ago
15

If the first step in the solution of the equation -9 + x = 5x - 7 is "subtract x," then what should the next step be?

Mathematics
1 answer:
DerKrebs [107]3 years ago
4 0
Add 7
so it will be like this

-9 + 7 = 5x - x
-2 = 4x
divide by 4
\frac{-2}{4} = \frac{4x}{4}
x = \frac{-1}{2}
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today's local newspaper lists 20 stocks of local interest. of those stocks ten increased five decreased and five remained unchan
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Answer:

P(x=2) = 0.2368

Step-by-step explanation:

given data

stocks of local interest N = 20

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solution

we take here no of stock that are increased randomly n = 2

so here Hypergeometric random variable can take integer value

{max(0, n+k - N ), min(n,K) } = {0,2}

so here

P(x=2)

so

P(x=k)  = \frac{(^K_k)\times (^{N-K}_{n-k}) }{(^N_n)}      .......................1

P(x=2 ) = \frac{(^{10}_2)\times (^{20-10}_{2-2}) }{(^{20}_2)}    

solve it we get

P(x=2 ) = 0.236842

now we use excel function as

HYPGEOM.DIST (k,n,N.cumulative)   .....................2

so it will be

HYPGEOM.DIST (2,2,10,,false)

we get

HYPGEOM.DIST (2,2,10,,false)  = 0.236842

so

P(x=2) = 0.2368

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