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lubasha [3.4K]
3 years ago
10

Together Vondra and Marion have 51 rocks.Marion has 2 times as many rocks as Vondra. How many rocks dose Marion have? How many r

ocks are in Vondra’s collection?
Mathematics
1 answer:
Otrada [13]3 years ago
3 0

Answer:

Marion has 34 rocks and Vondra has 17 rocks

Step-by-step explanation:

1. 51 ÷ 3 = 17

2. Because Marion has 2 times the amount of rocks as Vondra you have do 17 × 2 = 34

3. So, Marion has 34 rocks and Vondra has 17 rocks

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For a random sample of 50 measurements on the breaking strength of cotton threads, the mean breaking strength was found to be 21
Vikentia [17]

Answer:

205.81 to 214.19

Step-by-step explanation:

Sample size (n) = 50

Sample mean weight (X) = 210 grams

Sample standard deviation (s) = 18 grams

Confidence coefficient (Z) at 90% = 1.645

The confidence interval for the true mean breaking strength of cotton threads of this type, at a 90% confidence level, is given by:

CI=X \pm Z*\frac{s}{\sqrt n}\\CI=210 \pm 1.645*\frac{18}{\sqrt 50}\\CI = 210 \pm 4.19\\CI =205.81\ to\ 214.19

The confidence interval is 205.81 grams to 214.19 grams.

6 0
3 years ago
Whats the indicated operation?
Black_prince [1.1K]
4/11 * 10/8
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answer 5/11
you got it correct
7 0
3 years ago
For every 24meals Momoka prepared for customers last night, she prepared 2 meals for employees. Momoka prepared 156 meals.
Olenka [21]

Answer:

144 meals for customers and 12 meals for employees.

Step-by-step explanation:

156/24=6.5

6 x 24 =144

156-144=12

It adds up to be simple numbers, if it didn't it would make sense. For example, she wouldn't serve 6 and a <u>half</u> people. She would serve either 6 people or 7 people. She wouldn't serve 11.3973043 meals. She would serve either 11 meals or 12 meals.

6 0
3 years ago
Read 2 more answers
Find the value of x and y in the following figure where ABCD is a parallelogram<br><br>​
asambeis [7]

Answer:

x = 3

y = 2

Step-by-step explanation:

Diagonals of a parallelogram bisect each other into two equal segments. Therefore:

3x - 1 = 2(x + 1)

Solve for x

3x - 1 = 2x + 2

Collect like terms

3x - 2x = 1 + 2

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Also:

5y + 1 = 6y - 1

Collect like terms

5y - 6y = -1 - 1

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Divide both sides by -1

y = -2/-1

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5 0
3 years ago
How do i solve things that dont make sense to me even though i do know but dont know
kirill [66]

Answer:

Just try to make it make sense to you.

Step-by-step explanation:

For instance, a + 1 = 5

a = 4

We know that we should switch the terms as when it comes to normal numbers ,10 + 1 = 11 , 10 = 11-1. Therefore, the only trick is not to memorise, but try to understand the logic behind it. Hope this helps in some way???

7 0
2 years ago
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