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3 years ago

Help me with 2, 8, and 10 plz

Mathematics

1 answer:

OverLord2011 [107]3 years ago

3 0

For #2:

3x^2 + 4 – 2x^2 + 6

You need to combine your like terms:
 3x^2 – 2x^2= x^2

4 + 6 = 10

This will now give you:

X^2 +10

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The first eight quizzes in this class had average scores of 8,9,9,8,8,9,8,7. This gives a sample mean of 8.25 and a sample stand

alexira [117]

Answer:

Test statistic

$t = \frac{x^{-} -mean}{\frac{S}{\sqrt{n} } }$

t = 1.076

Step-by-step explanation:

Step(i):-

Given Mean of the Population (μ) = 8.0

Mean of the sample (x⁻) = 8.25

Given data

8,9,9,8,8,9,8,7

Given sample size n= 8

Given sample standard deviation(S) = 0.661

Step(ii):-

Null hypothesis : H: (μ) = 8.0

Alternative Hypothesis :H:(μ) > 8.0

Degrees of freedom = n-1 = 8-1=7

Test statistic

$t = \frac{x^{-} -mean}{\frac{S}{\sqrt{n} } }$

$t = \frac{8.25 -8.0}{\frac{0.661}{\sqrt{8} } }$

t = 1.076

Critical value

t₍₇,₀.₀₅₎ = 2.3646

The calculated value t = 1.076 < 2.3646 at 0.05 level of significance

Null hypothesis is accepted

Test the hypothesis that the true mean quiz score is 8.0 against the alternative that it is not greater than 8.0

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Samantha is making special edition hazelnut and almond chocolate boxes to give to her friends. It costs Samantha $15 to make one

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the answer is Bill Shorten

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Increase 840 in the ratio 2 : 3

Iteru [2.4K]

Ratios be 2x and 3x

$\\ \rm\longmapsto 2x+3x=840$

$\\ \rm\longmapsto 5x=840$

$\\ \rm\longmapsto x=\dfrac{840}{5}$

$\\ \rm\longmapsto x=168$

Now

2x=2(168)=336
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The solution to the linear equation is 2

<h3>How to solve the linear equation?</h3>

The linear equation is given as:

3x - 1 upon 5 = x - 1 upon 3

Rewrite properly as

(3x - 1)/5 = (x - 1)/3

Cross multiply

9x - 3 = 5x- 5

Evaluate the like terms

4x = 8

Divide by 4

x = 2

Hence, the solution to the linear equation is 2

Read more about linear equations at:

brainly.com/question/14323743

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Use substitution to write an equivalent quadiatic equation ( 3x^2)^2+7(3x +2) -8=0

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Answer:

9x^4+21x+6=0

Step-by-step explanation:

( 3x^2)^2+7(3x +2) -8=0

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9(x^4)+21x+14-8=0

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