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4 years ago

What is the answer to x=2(b-c2)

Mathematics

1 answer:

Viefleur [7K]4 years ago

4 0

Use the distributive property. 2b-2c^2=x

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what would be the ratio of the number of cans to the price at Super Saver and Price Buster if a coupon for $1 off the total purc

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It depends how much the cans cost

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3 years ago

In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be s

Sladkaya [172]

Answer:

The minimum sample size required is 5,499 computer users.

The major obstacle is that it is a big sample size if it is a small organization wanting to perform it.

Step-by-step explanation:

We need to calculate a sample size in order to have 95% confidence interval with 12 minutes of witdth.

So, we have that the difference between the upper limit and the lower limit is 12:

$UL-LL=12$

$(\mu+z*\sigma/\sqrt{n})-(\mu-z*\sigma/\sqrt{n})=12\\\\2z\sigma/\sqrt{n}=12\\\\\sqrt{n}=(1/6)*z\sigma\\\\n=(1/36)z^2\sigma^2$

For a 95% CI, the value of z is 1.96. The standard deviation is 227.

$n=z^2\sigma^2/36=(1.96)^2*(227)^2/36=3.8416*51,529/36=5498.72\\\\n=5499$

The minimum sample size required is 5,499 computer users.

6 0

3 years ago

91 more than a square of a number

ipn [44]

N^2 +91 is the answer

6 0

4 years ago

The difference between the largest and smallest values in a data set is the ______________.

Olenka [21]

Answer:

Range!

Step-by-step explanation:

It's the range because it's subtracting largest and smallest number in the set.

7 0

3 years ago

Solve the following system of equations.

natita [175]

That's a 3x3 linear system. Let's do Gaussian elimination

4 3 1 -10 A

1 -3 2 -8 B

11 -2 3 -38 C

0 15 -7 22 D=A-4B

0 31 -19 50 E=C-11B

0 1 -7/15 22/15 F=D/15

1 0 3/5 -18/5 G=B+3F

0 0 -68/15 68/15 H=E-31F -19-31(-7/15), 50-31(22/15)

0 0 1 -1 I=-15/68 H

1 0 0 -3 J=G - 3/5 I

0 1 0 1 K=F+ 7/15 I

We read off from the last three lines the

Answer: x=-3, y=1, z=-1

5 0

3 years ago