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3 years ago

The model represents the equation

Mathematics

2 answers:

Dafna11 [192]3 years ago

7 0

12-4=8 so then 8/4=2 so x=2

abruzzese [7]3 years ago

4 0

I think the triangles represent 2

If you do 2+2+2+2+4 that equals 12

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Here are 10 test scores: 50, 74, 76, 77, 78, 79, 80, 80, 82, 84. The mean of these scores is 76. How does removing the outlier 5

vitfil [10]

The answer is C.
The set has 50 as an outlier and removing it increases the mean by about 3.

Since 50 is significantly smaller number than all others, it is expected that removing 50 will increase the mean.
The first mean is 76:
 $X_{1} = \frac{50+74+76+77+78+79+80+80+82+84}{10} = \frac{760}{10} =76$

The mean after removing 50 is:
 $X_{2} = \frac{74+76+77+78+79+80+80+82+84}{10} = \frac{710}{90} =78.89$
X₂ ≈ 79

The difference between the second and the first mean is 79 - 76 = 3, thus
removing 50 as an outlier increases the mean by about 3.

8 0

2 years ago

Solve the following equation 2/7x + 2 = 6

Oksi-84 [34.3K]

Answer:

x=1/14

Step-by-step explanation:

2/7x+2=6

left part times 7x = right part times 7x is:

2+14x=42x

2=28x

x=1/14

3 0

3 years ago

Jeremy find the cost by adding the percents. 25% off of $60 is equal to 15% off of $60, then subtracting 10% from that cost is e

bonufazy [111]

Answer:

a. 25% off of $60 is equal to $45.

b. 15% off of $60, then subtracting 10% from that cost is equal to $45.

c. The two total costs are $45 and $45, and their addition is equal to $90 (i.e. $45 + $45 = $90).

Step-by-step explanation:

These can be determined as follows:

a. Calculation of the first total cost, i.e. 25% off of $60

25% of 60 = 25% * $60 = 15

First total cost = 25% off of $60 = $60 - (25% of $60) = $60 - $15 = $45

Therefore, 25% off of $60 is equal to $45.

b. Calculation of the second total cost, i.e. 15% off of $60, then subtracting 10% from that cost

15% of $60 = $9

10% of $60 = $6

Cost = 15% off of $60 = $60 - (15% of $60) = $60 - $9 = $51

Second total cost = Cost - (10% of $60) = $51 - $6 = $45

Therefore, 15% off of $60, then subtracting 10% from that cost is equal to $45.

c. The two total costs

The two total costs are 25% off of $60 which is equal to $45 and 15% off of $60, then subtracting 10% from that cost which is also equal to $45. The addition of the two costs is $90 (i.e. $45 + $45 = $90).

Therefore, the two total costs are $45 and $45, and their addition is equal to $90 (i.e. $45 + $45 = $90).

7 0

3 years ago

How to solve 3sin^2x= cos^2x

DochEvi [55]

I'll try it.
I just went through this twice on scratch paper. The first time was to
see if I could do it, and the second time was because the first result
I got was ridiculous. But I think I got it.

You said 3sin²(x) = cos²(x)

Use this trig identity: sin²(x) = 1 - cos²(x)

 Plug it into the original equation for (x).

 3(1 - cos²(x) ) = cos²(x)

Remove parentheses on the left: 3 - 3cos²(x) = cos²(x)

Add 3cos²(x) to each side: 3 = 4cos²(x)

Divide each side by 4 : 3/4 = cos²(x)

Take the square root of each side: cos(x) = (√3) / 2 .

There it is ... the cosine of the unknown angle.
Now you just go look it up in a book with a table cosines,
or else pinch it through your computer or your calculator,
or else just remember that you've learned that

 cos( 30° ) = (√3) / 2 .

7 0

3 years ago

Define altitude in a geometric way. (in geometry)

Sauron [17]

We was just talking about this in my geometric class today

An altitude is a line which passes through a vertex of a triangle, and meets the opposite side at right angles.

anyways it also on googIe

3 0

3 years ago

Read 2 more answers