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sweet-ann [11.9K]
3 years ago
12

(9x−4)−(2x−7) simplified

Mathematics
2 answers:
Andrej [43]3 years ago
8 0

Answer:

7x-11

Step-by-step explanation:

9 x  -  4  −  2 x  -  7

Next, group like terms:

9 x −  2 x  −  4  −  7

Now, combine like terms:

( 9 − 2 ) x + ( − 4 − 7 )

7 x +( − 11 )

7 x − 11

Ainat [17]3 years ago
4 0

Answer:7x+3

Step-by-step explanation:

(9x-4)-(2x-7)

Open brackets

9x-4-2x+7

Collect like terms

9x-2x-4+7

7x+3

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The ratio of tagged fish to untagged fish was 2 to 9. Ninety fish were tagged. How many fish were untagged
Nimfa-mama [501]

Answer:

405

Step-by-step explanation:

Since

2 : 9 = 90 : X

Then we know

9/2 = X/90

Multiplying both sides by 90 cancels on the right

90 × (9/2) = (X/90) × 90

90 × (9/2) = X

Then solving for X

X = 90 × (9/2)

X = 405

Therefore

2 : 9 = 90 : 405

5 0
3 years ago
For a population with µ = 100 and σ = 20, what is the X value corresponding to z = -0.75?​
Savatey [412]

The X value corresponding to z = -0.75 will be 85. Then the correct option is A.

<h3>What is the z-score?</h3>

The z-score is a statistical evaluation of a value's correlation to the mean of a collection of values, expressed in terms of standard deviation.

The z-score is given as

z = (x - μ) / σ

Where μ is the mean, σ is the standard deviation, and x is the sample.

For a population with µ = 100 and σ = 20.

Then the X value corresponding to z = -0.75 will be

-0.75 = (x - 100) / 20

   -15 = x - 100

      x = 85

Then the correct option is A.

More about the z-score link is given below.

brainly.com/question/15016913

#SPJ1

5 0
2 years ago
Viết tập hợp dưới dạng liệt kê <br> A = { x € Z : (x^2 + 5x - 6)(2x-1)=0}
love history [14]

Answer:

Step-by-step explanation:

A={1;-6;1/2}

6 0
3 years ago
Find the slope of the line that contains the points (-9, -3) and (-19, -3).
NNADVOKAT [17]

Answer:

Slope (m) = 0

Step-by-step explanation:

We will use this formula to find the slope⤵⤵⤵

\frac{y _{2} - y _{1}  }{x _{2} - x _{1}  }

(Sorry if it's a bit small btw)

Now we plug in the values accordingly:

-3 - (-3) = -3 + 3 = 0

-19 - (-9) = -19 + 9 = -10

Slope = 0/-10

So we have 0/-10, which means our slope is actually just 0.

(This also means that the line on the graph will be horizontal.)

Hope this helps you :)

7 0
3 years ago
Devonte have a loan of $39,650 loan has a simple interest rate of 4% per year what is the amount of interest at Devante will be
Naily [24]

Answer: $1582.40

Step-by-step explanation:

Since it's a simple interest rate, you just have to multiply $39,650 by 0.04, which is equal to 4%. When you do this, you get $1582.40.

3 0
3 years ago
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