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aksik [14]
3 years ago
12

3. Solve to determine the unknown variable in the

Mathematics
1 answer:
Nezavi [6.7K]3 years ago
6 0

Answer:

-1,2

Step-by-step explanation:

Sorry idk hope it hope have a good night or day

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A rowing team rowed 90 miles while going with the current in the same amount of time as it took to row 10 miles going against th
SVETLANKA909090 [29]

Answer:

5mph

Step-by-step explanation:

Let speed of boat in still water is s.

Distance proportional to speed

90/10 = (s+ 4)/(s - 4)

=> 9s - 36 = s + 4

=> 8s = 40

=> s= 5 mph

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8 0
2 years ago
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andrew11 [14]

Answer:

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Step-by-step explanation:

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3 0
2 years ago
-4 1/2 - 1 1/4 + 1 3/8
professor190 [17]

Answer:

4 3/8

Step-by-step explanation:

8 0
3 years ago
The manager of a local nightclub has recently surveyed a random sample of 280 customers of the club. She would now like to deter
Lunna [17]

Answer:

z = \frac{35.6-35}{\frac{5}{\sqrt{280}}}= 2.007

p_v = P(z>2.007) = 0.0224

Since the p value is lower than the significance level given of 0.05 we have enough evidence to reject the null hypothesis on this case. And the best conclusion for this case is:

We (reject) the null hypothesis. That means that we (found) evidence to support the alternative.

Step-by-step explanation:

We have the following info given:

\bar X = 35.6 represent the sampel mean for the age of customers

\sigma = 5 represent the population standard deviation

n = 280 represent the sample size selected

We want to test if the mean age of her customers is over 35 so then the system of hypothesis for this case are:

Null hypothesis: \mu \leq 35

Alternative hypothesis \mu >35

The statistic for this case is given by:

z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}

And replacing the data given we got:

z = \frac{35.6-35}{\frac{5}{\sqrt{280}}}= 2.007

We can calculate the p value since we are conducting a right tailed test like this:

p_v = P(z>2.007) = 0.0224

Since the p value is lower than the significance level given of 0.05 we have enough evidence to reject the null hypothesis on this case. And the best conclusion for this case is:

We (reject) the null hypothesis. That means that we (found) evidence to support the alternative.

5 0
3 years ago
Which expression converts 4pi radians to degrees?
grin007 [14]
4pi/2pi = x/360
use a proportion
2 radians equals 360 degrees
x = 720 degrees
7 0
3 years ago
Read 2 more answers
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