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Drupady [299]
3 years ago
14

Write an expression that represents the amount of hydrochloric acid in x gallons of a 3% hydrochloric acid solution.

Mathematics
1 answer:
ziro4ka [17]3 years ago
8 0
X=3%h I think I'm not to sure hope that helped! Good Luck!!!
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Lisa can paint a wall in four hours. Sissi needs eight hours to paint the wall. How long will it take if they are helped?
never [62]

Answer:

It will take very less time actually. we cannot say accurately because if two girls start to chat they will till next day

4 0
2 years ago
HELP!!! What are the quotient and remainder when x^3 + 9x^2 + 21x + 24 is divided by x + 2? PLEASE HELP
Sedaia [141]

Answer:

A) The quotient is x^2+7x+7 and the remainder is 10.

Step-by-step explanation:

Set up the synthetic division using the coefficients of the numerator and the root in the denominator. Divide using the rules for synthetic division.

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3 years ago
A piece of equipment is purchased for $18,000.00 and has a salvage value of $2,000.00. The estimated life is 10 years and the me
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6 0
3 years ago
-c = 3abc-a; solve for c
emmainna [20.7K]

Answer:

C= 12

Step-by-step explanation:

8 0
3 years ago
A recent survey based on a random sample of n=470 voters, predicted that independent candidate for the mayoral election will get
julsineya [31]

I have an expression

\sigma = \sqrt{p(1-p)/n}

floating around in my head; let's see if it makes sense.

The variance of binary valued random variable b that comes up 1 with probability p (so has mean p) is

E( (b-p)^2 ) =  (-p)^2(1-p) + (1-p)^2p = p(1-p)

That's for an individual sample. For the observed average we divide by n, and for the standard deviation we take the square root:

\sigma = \sqrt{p(1-p)/n}

Plugging in the numbers,

\sigma = \sqrt{.24(1-.24)/490} = 0.019 = 1.9\%

One standard deviation of the average is almost 2% so a 27% outcome was 3/1.9 = 1.6 standard deviations from the mean, corresponding to a two sided probability of a bit bigger than 10% of happening by chance.

So this is borderline suspect; most surveys will include a two sigma margin of error, say plus or minus 4 percent here, and the results were within those bounds.

7 0
3 years ago
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