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schepotkina [342]
3 years ago
14

Lin runs 8 laps around a track in 10 minutes.

Mathematics
1 answer:
PSYCHO15rus [73]3 years ago
7 0
A) 1.25 minutes per lap- divide 10 by 8
B)0.8 laps or 4/5 per minutes- divide 8 by 10
C) 22.5 minutes- multiply 18*1.25
Those are three nest answers i can give, i’m not sure
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A random sample of 70 printers discovered that 25 of them were being used in small businesses. find the 95% limit for the popula
kvasek [131]

Answer:

The sample proportion of printers used in small business is:

\hat{p}=\frac{25}{70}=0.3571

The 95% confidence interval for the population proportion of printers that are used in small businesses is:

\hat{p} \pm z_{\frac{0.05}{2}} \sqrt{\frac{\hat{p}(1-\hat{p})}{n} }

Where:

z_{\frac{0.05}{2}}=1.96 is the critical value at 0.05 significance level

\therefore 0.3571 \pm 1.96 \sqrt{\frac{0.3571(1-0.3571)}{70} }

         0.3571 \pm 0.1122

         \left ( 0.3571 - 0.1122, 0.3571 + 0.1122 \right)

         \left(0.245,0.469 \right)

Therefore, the 95% confidence interval for the population proportion of printers that are used in small businesses is (0.245 , 0.469)



7 0
3 years ago
Brian is driving on a highway. He uses one gallon of gas every 20 miles he drives. The distance, D (in miles), he travels on g g
Dennis_Churaev [7]

Answer:

40 miles

Step-by-step explanation:

20x2

8 0
2 years ago
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Solving Exponential and Logarithmic Equation In exercise,solve for x or t.See example 5 and 6.
nalin [4]

Answer:x=15

Step-by-step explanation:

You should collect the like terms first

21-6=x

Therefore

X=15

6 0
3 years ago
Solve 6(2)x = 384.<br> will mark brainliest !
julsineya [31]

Answer:

6(2)x = 384

12x = 384

12x/12 = 384/12

x = 32

Step-by-step explanation:

7 0
2 years ago
The overall changein isaiah score in the first two rounds of a video games is 0 poing. if his score changed by -22 points in the
Rashid [163]

The change in the first round is -22.

The change in the second round is unknown, so we let x = the change in the second round.

When we add the two changes we get an overall change of 0.

-22 + x = 0

Add 22 to both sides of the equation.

x = 22

The change in the second round is 22 points because when you add 22 points to -22 points you get the overall change of 0 points.

7 0
3 years ago
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