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3 years ago

Factor 144x2+312x+169,

Mathematics

1 answer:

Flura [38]3 years ago

4 0

Answer:

Number 6 is b

Step-by-step explanation:

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13.) |-6-(-2) Pleaseeee helppp

gogolik [260]

Answer:

-4

Step-by-step explanation:

think of it like this -6+2

7 0

4 years ago

City health officials will conduct a two-sample t-test for a difference in means to investigate whether

Anvisha [2.4K]

Answer:

The calculated value t = 2.366 > 2.0301 at 0.05 level of significance

The null hypothesis is rejected

There is a difference between the means

Step-by-step explanation:

Step(i):-

Given that the first sample size 'n₁' = 22

Given that the mean of the first sample x₁⁻ = 120

Given that the standard deviation of the sample (s₁) = 20

Given that the mean of the second sample x₂⁻ = 100

Given that the standard deviation of the second sample (S₂) = 30

Step(ii):-

T-test statistic

$t = \frac{x^{-} _{1} -x^{-} _{2} }{\sqrt{S^{2} (\frac{1}{n_{1} }+\frac{1}{n_{2} } ) } }$

where

$S^{2} = \frac{n_{1} S_{1} ^{2}+n_{2} S_{2} ^{2} }{n_{1} +n_{2}-2 }$

$S^{2} = \frac{22( 20)^{2}+ 15(30) ^{2} }{22 +15-2 }$

S² = 637.1428

S = √637.1428 = 25.24168

The standard deviation of the sample 'S' = 25.24168

Step(iii):-

Null Hypothesis:H₀:

There is no difference between the means

Alternative Hypothesis:H₁:

There is a difference between the means

T-test statistic

$t = \frac{x^{-} _{1} -x^{-} _{2} }{\sqrt{S^{2} (\frac{1}{n_{1} }+\frac{1}{n_{2} } ) } }$

$t = \frac{ 120 -100 }{\sqrt{637.14 (\frac{1}{22 }+\frac{1}{15 } ) } }$

t = 2.366

Degrees of freedom

γ = n₁+n₂ -2 = 22+15-2 = 35

t₀.₀₅ = 2.0301

The calculated value t = 2.366 > 2.0301 at 0.05 level of significance

The null hypothesis is rejected

There is a difference between the means

3 0

3 years ago

Read 2 more answers

Please help me i need this grave !

Mice21 [21]

Answer:

Step-by-step explanation:

nvm i figured it out just do 7^2 + 8^2

5 0

3 years ago

Twenty three hundredths in decimals

guapka [62]

Answer:

0.23

Step-by-step explanation:

Since 23 hundredths is 23 over one hundred, 23 hundredths as a Fraction is 23/100. If you divide 23 by one hundred you get 23 hundredths as a decimal which is 0.23. To get 23 hundredths as a Percent, you multiply the decimal with 100 to get the answer of 23 percent.

8 0

4 years ago

V <img src="https://tex.z-dn.net/?f=%20%7Bv%7D%5E%7B2%7D%20%20%20%3D%20%20%7Bu%7D%5E%7B2%7D%20%20%2B%202as%20" id="TexFormula

natulia [17]

Answer:

The area under the line of the velocity-time graph is the distance travelled by the object in the time t.

For example u = 20m/s and t = 300 s

Distance (s) = ut = 20 x 300 = 6000 m

Step-by-step explanation:

8 0

3 years ago