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2 years ago

Simplify the expression 3x -2y+6-6x+5y-8

Mathematics

2 answers:

qaws [65]2 years ago

5 0

You combine like terms

therefore the answer is -3x+3y-2

Ymorist [56]2 years ago

4 0

Answer:

-3x + 3y - 2

Step-by-step explanation:

Collect like terms and add/subtract

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2500 pounds x 1000 days

250,000 pounds is how much the elephant eats in 1,000 days.

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3 years ago

A man and woman share money in the ratio 3:2 if the sum of money doubled in what ratio should be divided so that the man should

Valentin [98]

Answer:

6:4

Step-by-step explanation:

3 x 2 = 6

2 x 2 = 4

6:4

6 0

2 years ago

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The measure of angle 1 is 130°.

eimsori [14]

Answer:

The angle opposite angle 1

Step-by-step explanation:

Opposite angles have the same degree when two lines intersect because they are vertical angles.

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3 years ago

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The average daily volume of a computer stock in 2011 was ų=35.1 million shares, according to a reliable source. A stock analyst

Shtirlitz [24]

Answer:

The null hypothesis is $H_o : \mu = 35 .1 \ million \ shares$

The alternative hypothesis $H_a : \mu \ne 35.1\ million \ shares$

The 95% confidence interval is $27.475 < \mu < 37.925$

Step-by-step explanation:

From the question the we are told that

The population mean is $\mu = 35.1 \ million \ shares$

The sample size is n = 30

The sample mean is $\= x = 32.7 \ million\ shares$

The standard deviation is $\sigma = 14.6 \ million\ shares$

Given that the confidence level is $95\%$ then the level of significance is mathematically represented as

$\alpha = 100-95$

$\alpha = 5\%$

=> $\alpha = 0.05$

Next we obtain the critical value of $\frac{\alpha }{2}$ from the normal distribution table

The value is $Z_{\frac{\alpha }{2} } = 1.96$

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{ \sigma }{\sqrt{n} }$

substituting values

$E = 1.96 * \frac{ 14.6 }{\sqrt{30} }$

$E = 5.225$

The 95% confidence interval confidence interval is mathematically represented as

$\= x -E < \mu < \= x +E$

substituting values

$32.7 - 5.225 < \mu < 32.7 + 5.225$

$27.475 < \mu < 37.925$

6 0

2 years ago

If (a+b) / (x−y) = 3/5 then (10a + 10b) / (9x−9y) = ?

lbvjy [14]

Answer:

2/3

Step-by-step explanation:

Look at what you are getting on the right hand question. 10a +10b has a common factor that can be pulled out. It is 10

10a + 10b = 10(a + b)

Now look at the denominator

9x - 9y = 9(x -y)

There are a lot of possible answers.

Mine would be to multiply 3/5 * 10/9

$\dfrac{3}{5}*\dfrac{10}{9} = \dfrac{30}{45} = \dfrac{2}{3}$

(10a + 10b)/(9x - 9y) = 2/3

5 0

2 years ago

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