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2 years ago

Nal parts. The Which statements about the clock are accurate? Check

Mathematics

2 answers:

bearhunter [10]2 years ago

8 0

Answer:

1 - 3 - 5

Step-by-step explanation:

i took in the page

KATRIN_1 [288]2 years ago

6 0

Answer:

The central angle measure when one hand points

at 2 and the other points at 4 is 60°

The circumference of the clock is about 19 in.

With one hand at 5 and the other at 10, the minor

arc formed by the hands is about 15.7 in.The minor arc measure when one hand points at 1

and the other hand points at 9 is 150° The length of the minor arc between 11 and 2 is the

same as the length of the minor arc between 7 and

10.

Step-by-step explanation:just learned it

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Donna is a computer repair person. She charges a flat fee of $20 for each computer plus an hourly charge of $9 per hour. Yesterd

ollegr [7]

Answer:

$147

Step-by-step explanation:

20×6=120 9×3=27. 120+27=147

5 0

2 years ago

Find three consecutive even integers whise sum is 222

dangina [55]

74....74....74............

6 0

3 years ago

Read 2 more answers

Suppose that the mean water hardness of lakes in Kansas is 425 mg/L and these values tend to follow a normal distribution. A lim

tino4ka555 [31]

Answer:

The mean water hardness of lakes in Kansas is 425 mg/L or greater.

Step-by-step explanation:

We are given the following data set:

346, 496, 352, 378, 315, 420, 485, 446, 479, 422, 494, 289, 436, 516, 615, 491, 360, 385, 500, 558, 381, 303, 434, 562, 496

Formula:

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean =\displaystyle\frac{10959}{25} =438.36$

Sum of squares of differences = 175413.76

$S.D = \sqrt{\dfrac{175413.76}{24}} = 85.49$

Population mean, μ = 425 mg/L

Sample mean, $\bar{x}$ = 438.36

Sample size, n = 25

Alpha, α = 0.05

Sample standard deviation, s = 85.49

First, we design the null and the alternate hypothesis

$H_{0}: \mu \geq 425\text{ mg per Litre}\\H_A: \mu < 425\text{ mg per Litre}$

We use one-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }$

Putting all the values, we have

$t_{stat} = \displaystyle\frac{438.36 - 425}{\frac{85.49}{\sqrt{25}} } = 0.7813$

Now, $t_{critical} \text{ at 0.05 level of significance, 24 degree of freedom } = -1.7108$

Since,

The calculated t-statistic is greater than the critical value, we fail to reject the null hypothesis and accept it.

Thus, the mean water hardness of lakes in Kansas is 425 mg/L or greater.

6 0

3 years ago

One thumbtack weighs 0.25 ounce. How many thumbtacks are in a box that has a mass of 3500 grams? (Hint: 1oz ~28g

Marina86 [1]

Alright so .25 oz is 1/4 of 1oz. Therefore you take 28 and divide it by 4 and get 7.

Then take 3500 and divide it by 7 which makes 500 thumb tacks.

I think idk though.

7 0

3 years ago

Elise drew p pictures. Nora drew 70 fewer pictures than Elise. Write an expression that shows how many pictures Nora drew

Naily [24]

Answer:

p - 70

Step-by-step explanation:

elsie drew = p

nora drew = p - 70

4 0

2 years ago

Read 2 more answers