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xenn [34]
3 years ago
12

Somebody please help me with the question

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
3 0
50 is the answer.
We know that 60% is equal to 0.60. We don’t need to write the extra 0 in the end, so we can just write 0.6
. So, the question is saying that 30 is 0.6 of the total number of marbles. This means that 30 is 0.6 times the total number of marbles.
To write this in equation form, I will use x to represent the total number of marbles:
30=0.6x
Now, we need to solve for x.
On one side of the equation we have only x, and in the other side we only have a number.
So, to solve it, we need to divide both sides of the equation by the coefficient on x, which is 0.6.
30/0.6 = 0.6/0.6x
Solve:
30/0.6 = x
x = 50
The answer is 50.
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Which equation represents a line that is perpen-
Arada [10]

Answer:

A

Step-by-step explanation:

If you substitute the values given in the question, i.e. (-10,3), the only equation that satisfies this solution is A.

Try substituting

x for (-10)

y for (3)

4 0
3 years ago
URGENT: Can someone help me solve these problems?
katrin2010 [14]

Answer:

12

Step-by-step explanation:

21=31

31=7+2-3+0=12

This is correct because linear equations mean add subtract divide and multiply instead of finding roots and squares

3 0
3 years ago
2. (08.01) Two lines, R and M, are represented by the following equations: Line R: 2x + 2y = 18 Line M: x + y = 9 Which statemen
bulgar [2K]

Answer:

infinitely many solutions

Step-by-step explanation:

Given the 2 equations

2x + 2y = 18 → (1)

x + y = 9 → (2)

Equation (1) is twice (2)

Thus the equations are equal and will have infinite solutions

7 0
3 years ago
Find the standard deviation. Round to the nearest tenth. 1, 2, 11, 8, 16, 16,20, 16, 18 OA. 6.5 O B. 6.9 O C. 1.5 ? D. 7.4
NikAS [45]

Answer:

A. 6.5

Step-by-step explanation:

First we find the average  \bar{x} of the 9 data:

\bar{x} =\frac{\sum_{x=1}^{n}x_{i}}{n}

Where n is the data number, that in this case is 9.

\bar{x} =\frac{1+ 2+ 11+ 8+ 16+ 16+20+ 16+ 18}{9}=12\\

The formula of the standard deviation \sigma is:

\sigma=\sqrt{\frac{\sum_{x=1}^{n}(x_{i}-\bar{x})^{2}}{n}}

We replace the data and find the value of the standard deviation:

\sigma=\sqrt{\frac{(1-12)^{2}+(2-12)^{2}+(11-12)^{2}+(8-12)^{2}+(16-12)^{2}+(16-12)^{2}+(20-12)^{2}+(16-12)^{2}+(18-12)^{2}}{9}}

\sigma=\sqrt{\frac{(-11)^{2}+(-10)^{2}+(-1)^{2}+(-4)^{2}+(4)^{2}+(4)^{2}+(8)^{2}+(4)^{2}+(6)^{2}}{9}}=6,54

We approximate the number and the solution is 6,5

6 0
4 years ago
Craig started the summer with 10 freckles. The number of freckles, F, has doubled each week, W, since summer began. Which equati
mixer [17]

Answer:

The answer to your question is letter D

Step-by-step explanation:

Letter A. It is not possible because it is necessary to considers the variable (number of weeks)and this option does not consider it.

Letter B. It is not possible besides it consider the number of weeks the results do not correspond with the conditions given.

Example: for week 1, the number of freckles is 10 + 2¹ = 10 + 2 = 12, and the number of freckles must be 20.

Letter C. It is incorrect because the numbers of freckles do not correspond with the conditions.

Example:   week 2    f = 2(10) ² = 2(100) = 200, it is higher than the expected.

Letter D. This is the correct answer because it satisfied the conditions given.

4 0
3 years ago
Read 2 more answers
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