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ziro4ka [17]
3 years ago
11

Evaluate 2-8÷-2-3-12÷-6×-2​

Mathematics
1 answer:
Effectus [21]3 years ago
5 0

Answer:

7

Step-by-step explanation:

2-8÷-2-3-12÷-6×-2

2 - -4 - 3 - 2 x -2

2 + 4 + -3 - -4

6 + -3 + 4

3 + 4

7 :)

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What is the answer to -19+12
galina1969 [7]
Hi. 

-19 + 12 is the same as saying 12 - 19

So, -19 + 12 = -7

You're welcome. 
6 0
3 years ago
Read 2 more answers
Solve the system using substitution.
Maru [420]

Answer:

Given: The following system:

4x + y − 2z=18          ......[1]

2x-3y+3z = 21          ......[2]

x-3y=6                      ......[3]

we can write equation [3] as;

3y = x-6                     ......[4]

Multiply by 3 in equation [1] to both sides of an equation we get,

3 \cdot(4x+y-2z)= 3\cdot 18 or

12x+3y-6z=54              ......[5]

Substituting the equation [4] in [2] and [5] we get;

2x-(x-6)+3z=21 or

2x-x+6+3z=21

Simplify:

x+3z=15            .....[6]                       [combine like terms]

12x+x-6-6z =54

Simplify:

13x-6z=60         ......[7]        [Combine like terms]

On Solving equation [6] and [7] simultaneously,

x+3z=15

13x-6z=60

we get the value of x

i.e, x=6

Substitute the value of x in equation x+3z=15  we get

6+3z=15 or

3z=9

Simplify:

z=3

Also, substitute the value of x=6 in equation [3] we get the value of y;

x-3y=6

6-3y=6 or

-3y = 0

Simplify:

y = 0

Therefore, the solution to the system of three linear equation is, (6, 0 , 3)


5 0
3 years ago
Please help me with sum​
krok68 [10]

Step-by-step explanation:

39 x 9 = 351

16 x 8 = 128

36 x 3 = 108

28 x 4 = 112

79 x 6 = 474

15 x 3 = 45

28 x 4 = 112

12 x 7 = 84

38 x 2 = 76

95 x 3 = 285

----------------------©--------------------©--------------------_

7 0
2 years ago
An important factor in selling a residential property is the number of times real estate agents show a home. A sample of 23 home
liberstina [14]

Using the t-distribution, it is found that the 95% confidence interval for the mean number of people the houses were shown is (20.1, 27.9).

We have the <u>standard deviation for the sample</u>, hence the t-distribution is used to build the confidence interval. Important information are given by:

  • Sample mean of \overline{x} = 24.
  • Sample standard deviation of s = 9.
  • Sample size of n = 23

The confidence interval is:

\overline{x} \pm t\frac{s}{\sqrt{n}}

In which t is the critical value for a <u>95% confidence interval with 23 - 1 = 22 df</u>, thus, looking at a calculator or at the t-table, it is found that t = 2.0739.

Then:

\overline{x} - t\frac{s}{\sqrt{n}} = 24 - 2.0739\frac{9}{\sqrt{23}} = 20.1

\overline{x} + t\frac{s}{\sqrt{n}} = 24 + 2.0739\frac{9}{\sqrt{23}} = 27.9

The 95% confidence interval for the mean number of people the houses were shown is (20.1, 27.9).

A similar problem is given at brainly.com/question/15180581

6 0
2 years ago
Help ASAP please with this question.
GuDViN [60]
The answer: c. 24 
1/2 x 24 = 12 
3 0
3 years ago
Read 2 more answers
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