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Lyrx [107]
3 years ago
15

A truck with a heavy load drove from Boston to New York at 45 mph. After unloading, it returned from New York to Boston at a spe

ed of 65 mph. What was its average speed for the whole trip?
btw its not 55
plz help!!!!!!!!!!!<3
Mathematics
2 answers:
kap26 [50]3 years ago
6 0

Answer:

53.18

Step-by-step explanation:

Ksju [112]3 years ago
4 0
Average speed is 53
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Answer:

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Step-by-step explanation:

Point slope form:

y-y_1=m\left(x-x_1\right)

<em>Note: </em>

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Our answer would be y+3=\frac{1}{2} \left(x-6)

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3 years ago
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An SRS of 450 450 high school seniors gained an average of ¯ x = 20 x¯=20 points in their second attempt at the SAT Mathematics
maria [59]

Answer: (15.47, 24.53)

Step-by-step explanation:

We know that the confidence interval for population mean is given by :_

\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}

, where n= sample size.

\sigma = standard deviation.

\overline{x}= sample mean.

z*= Critical value.

Given : n= 450

\overline{x}=20

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Critical value for 95% confidence = z*=1.96     [From z-value table]

Then, the 95% confidence interval will be :-

20\pm (1.96)\dfrac{49}{\sqrt{450}}

\approx 20\pm (1.96)(2.31)

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Hence, the 95% confidence interval for the mean change in score μ μ in the population of all high school seniors. : (15.47, 24.53)

3 0
3 years ago
What is the solution to equation? <br><br> 4x+5=2x-3
Masteriza [31]
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8 0
3 years ago
Answer this and get 15 points if correct!!! What is 25 x 30 + 6 - 12
Rashid [163]

Step-by-step explanation:

the answer is 744..........

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bija089 [108]

Answer:

  32

Step-by-step explanation:

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__

The applicable rules of logarithms are ...

  log(ab/c) = log(a) +log(b) -log(c)

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