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2 years ago

9

polly the carrot has learned to say "polly wants a cracker." if she says it every five minutes for two hours and gets a cracker

to eat each time, how many crackers will polly eat?

1 answer:

schepotkina [342]2 years ago

3 0

Answer:

24

Step-by-step explanation:

(60 × 2 ) ÷ 5 = 24.

60 because hour is 60 minutes

× 2 because she says it for 2 hours

÷ 5 because she says it every 5 minutes

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2x - 8<br> X-3<br> 4. What is the value of x?<br> (a) 3<br> (c) 9<br> (b) 15<br> (d) 30<br> 5<br> 3

azamat

I believe it’s 9 but unsure sorry

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3 years ago

A store sells a package of 25 trading cards for $5.25. Use pencil and paper. Explain how you can tell that the unit price per c

zzz [600]

Answer:

21 cent per card

Step-by-step explanation:

5.25 / 25 = .21

because 25 can be divided into the first 2 numbers

6 0

2 years ago

Each of 16 students measured the circumference of a tennis ball by four different methods, which were:Method A: Estimate the cir

lys-0071 [83]

Answer:

a) $\bar X_A =22.744$

$\bar X_B =20.7$

$\bar X_C =21.013$

$\bar X_D =18.306$

b) $Median_A =\frac{23+24}{2}=23.5$

$Median_B =\frac{20.4+20.4}{2}=20.4$

$Median_C =\frac{21+21}{2}=21$

$Median_D =\frac{20.7+20.7}{2}=20.7$

c) $\bar X_A =23.25$

$\bar X_B =20.7$

$\bar X_C =21.04$

$\bar X_D =20.69$

Step-by-step explanation:

Data given

Assuming the following data:

Method A: 18.0, 18.0, 18.0, 20.0, 22.0, 22.0, 22.5, 23.0, 24.0,24.0,25.0,25.0, 25.0,25.0,26.0,26.4

Method B: 18.8, 18.9, 18.9, 19.6, 20.1, 20.4, 20.4, 20.4, 20.4,20.5, 21.2. 22.0,22.0, 22.0,22.0,23.6

Method C: 20.2, 20.5, 20.5, 20.7, 20.8, 20.9, 21.0, 21.0,21.0,21.0, 21.0, 21.5,21.5,21.5,21.5,21.6

Method D: 20.0, 20.0, 20.0,-20.0, 20.2, 20.5, 20.5, 20.7, 20.7,20.7, 21.0, 21.1, 21.5, 21.6, 22.1,22.3.

Part a

The sample mean is defined as:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

If we apply this formula for the four methods we got:

$\bar X_A =22.744$

$\bar X_B =20.7$

$\bar X_C =21.013$

$\bar X_D =18.306$

Part b

Since the total number of points for each method is 16 and this is an even number we need to calculate the median as the average between the 8th and the 9th position of the data ordered from the smallest to the largest. If we do this we have that:

$Median_A =\frac{23+24}{2}=23.5$

$Median_B =\frac{20.4+20.4}{2}=20.4$

$Median_C =\frac{21+21}{2}=21$

$Median_D =\frac{20.7+20.7}{2}=20.7$

Part c

The trimmed mean by 20% means that we need to calculate removing the 20% from each of the tails, the 20% of 16 is 3.2, so we need to remove 3 observations from both ends of the data like this:

Method A: 20.0, 22.0, 22.0, 22.5, 23.0, 24.0,24.0,25.0,25.0, 25.0

Method B: 19.6, 20.1, 20.4, 20.4, 20.4, 20.4,20.5, 21.2. 22.0,22.0

Method C: 20.7, 20.8, 20.9, 21.0, 21.0,21.0,21.0, 21.0, 21.5,21.5

Method D: 20.0 20.2, 20.5, 20.5, 20.7, 20.7,20.7, 21.0, 21.1, 21.5.

If we calculate the mean for each method we got:

$\bar X_A =23.25$

$\bar X_B =20.7$

$\bar X_C =21.04$

$\bar X_D =20.69$

3 0

2 years ago

What is the negative angle that is coterminal with 120∘120∘. write your answers in radians?

weeeeeb [17]

To find a positive and a negative angle coterminal with a given angle, you can add and subtract 360°.

$120^o-360^o=-240^o=-\dfrac{240\pi}{180}=-\dfrac{4\pi}{3}$

8 0

3 years ago

2) The product of 8 and a number is 104.<br> What is the number?<br> Write the equation

Vlad [161]

Answer:

The equation is 8 x 13 = 104

4 0

2 years ago