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NikAS [45]
3 years ago
11

Petty has 81 red balls, which she wants to arrange in rows. of the number in each row must be equal to the number of rows, how m

any balls must there be in a row
​
Mathematics
1 answer:
monitta3 years ago
3 0

Answer:

9 balls in each row.

Step-by-step explanation:

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The average monthly cell phone bill was reported to be $50.07 by the U.S. Wireless Industry. Random Sampling of a large cell pho
zalisa [80]

Answer:

The null and alternative hypotheses are:

H_{0}:\mu= 50.07

H_{a}:\mu>50.07

Under the null hypothesis, the test statistic is:

t=\frac{\bar{x}-\mu}{\frac{s}{\sqrt{n}} }

Where:

\bar{x} = 52.86 is the sample mean

s=7.0132 is the sample standard deviation

n=10 is the sample size

\therefore t=\frac{52.86-50.07}{\frac{7.0132}{\sqrt{10}} }    

          =1.26

Now, the right tailed t critical value at 0.05 significance level for df = n-1 = 10-1 = 9 is:

t_{critical}=1.833

Since the t statistic is less than the t critical value at 0.05 significance level, therefore,we fail to reject the null hypothesis and conclude that there is not sufficient evidence to support the claim that the average phone bill has increased.


4 0
3 years ago
Help will give brainliest
Marta_Voda [28]

Answer: 12 miles equals 1 inch

Step-by-step explanation:

4 0
3 years ago
Jackie ordered a set of wood and metal clothes pins. Of the 276 pins, 172 were wood. What percentage of the clothes pins were me
timurjin [86]

We know that 172 of them were wood, so the rest are metal. To find that number we do:

276 - 172 = 104 metal pins.

To find the percentage that they were metal, take the number of metal pins and divide by the total number of pins:

104/276 is about 0.3768.

Multiply this by 100:

37.68

So, the percent of metal pins is 37.68%.

8 0
3 years ago
The figure below has a point marked with a large dot.
OleMash [197]

Therefore ,The marked point will now have the updated coordinates P' (2, 7).

<h3>Define Translation of Points on a Coordinate Plane.</h3>

When a figure is transferred from one area to another without altering its size, shape, or orientation, a translation takes place. If we know which way and how far the figure to be moved, we can draw the translation in the coordinate plane.

Here,

On an X-Y coordinate plane, a figure is plotted.

When translating a figure 7 units to the down, we must provide the coordinates of the indicated point in the original figure

"(x, y)" = "(x + m, y + n)"

In response to the query, we have

The specified point's coordinates are: P (5,4).

The new coordinates of the indicated spot after this figure is translated 6 units to the right will be -

P'( 5,4- 7) = P'(5, -3) (5, -3)

As a result, the designated point's new coordinates are P' (5, -3)

The new coordinates of the marked point will be - P'(5, -3)

To know more about translation of points , visit

brainly.com/question/17151240

#SPJ1

6 0
1 year ago
Evaluate 15cos60<br> Options are <br> A) -0.5<br> B)7.5<br> C)-14.5
USPshnik [31]

\cos60^o=\dfrac{1}{2}\\\\\text{Therefore}\\\\15\cos60^o=15\cdot\dfrac{1}{2}=7.5\\\\Answer:\ \boxed{B)\ 7.5}

6 0
3 years ago
Read 2 more answers
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