3 years ago

PLease answer and explain number 8 and 9 for 10 points and brainlest

Mathematics

1 answer:

Whitepunk [10]3 years ago

4 0

I think it has to be orange x green

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To get to work, you drive for 20 minutes at 30 mph, and walk 10 more minutes at 3 mph. What was your average speed?

fiasKO [112]

<span>Note D = r(t)
20min = 1/3 hr and 10min = 1/6 hr

(1/3hr)30mph + (1/6hr)3mph = 10.5 mi, the total distance traveled.

total distance / total time = average speed = 10.5/(1/3 + 1/6) = 10.5/(2/6 + 1/6)
10.5mi/.5hr = 21mph

Hope This Helps </span>

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ElenaW [278]

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Q: The perimeter of triangle is 240. it sides are proportional to 3:4:5. The largest side of triangle is

kotegsom [21]

240= 3x +4x 5x
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4 years ago

The value of t∗ for a 95% confidence interval when there are 10 pieces of data is:

Anarel [89]

Answer:

The t-critical value for 95% confidence interval is ±2.2621

Step-by-step explanation:

We are given the following information in the question:

Sample size, n = 10

Alpha, α = 0.05

We have to find the value of t-critical at 95% confidence interval.

Degree of freedom = n - 1 = 9

$t_{critical}\text{ at degree of freedom 9 and}~\alpha_{0.05} = \pm 2.2621$

The t-critical value for 95% confidence interval is ±2.2621

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3 years ago