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lakkis [162]
3 years ago
7

Solve 2x - 9 - 7x = 11. A. -4 B. -1/4 C.2/5 D. 4

Mathematics
1 answer:
LenaWriter [7]3 years ago
5 0
2x-9-7x=11
-5x-9=11
-5x=11+9
-5x=20
x=20/-5
x=-4
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Write the pair of fractions as a pair of fractions with a common denominator 3/4 and 2/5
omeli [17]

Answer:

The common denominator \frac{15}{20} and \frac{8}{20}

Step-by-step explanation:

To find the common denominator:

  • We have to find the LCD of the denominators.
  • Then multiply the fraction with the digit obtained from dividing the LCD with the denominator of the fraction concerned.

Here is the work:

LCD of (4,5) is (4\times 5)=20.

So we will divide 20 with 4 and then with 5 the quotient will further be put into the fraction.

So

\frac{20}{4}=5 will make the fraction \frac{3}{4} as \frac{3\times 5}{4\times 5} =\frac{15}{20}.

Similarly

\frac{20}{5}=4 will make the fraction \frac{2}{5} as \frac{2\times 4}{5\times 4} =\frac{8}{20}.

Hence with common denominators the fraction can be written as (\frac{15}{20}),(\frac{8}{20}).

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4 years ago
If the mean of a normal distribution is 26, what is the median of the distribution? O A. 22 O B. 14 C. 26 D. 18 SUB​
Mademuasel [1]

Answer:

B

Step-by-step explanation:

26 divides by 2 = 13

13+2=14

7 0
3 years ago
Which list shows the numbers in order from greatest to least? A) 2.022 > 2.51 > 2.505 > 2.52 B) 7.117 > 7.37 > 7.
Tresset [83]

Answer:

d

Step-by-step explanation:

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4 years ago
If a gang of eight rob a bank, what percent of the loot belongs to three of the robbers? What percent belongs to them if two of
zaharov [31]

Answer:

(assuming all members of the gang get equal percentages)

For a gang of 8: 12.5% (100/8)

If 2 are killed: 16.67% (100/6), so percentage increases by roughly 4.2% (16.67-12.5)

Percent that belongs to 3: 12.5%*3=37.5%

Percent that belongs to 3 if 2 are killed: 16.67%*3=50.0%

Each robber's share still increases by 4.2% (50%-37.5%=12.5%, 12.5%/3=4.2%)

If you would like additional help with math or another subject, check out growthinyouth.org!

Step-by-step explanation:

5 0
4 years ago
I don’t understand this
tatyana61 [14]

9514 1404 393

Answer:

  f⁻¹(x) = √((3 -x)/3)

Step-by-step explanation:

A function gives you a y-value for each value of x.

  y = f(x)

__

An inverse function tells you the x value that produced a given y-value. It is the solution to the equation ...

  x = f(y)

So, we want to find y for ...

  x = -3y² +3

  x -3 = -3y² . . . . . . . . . . . subtract 3

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  √((x -3)/-3) = y . . . . . . . take the square root.

The requirement for x > 0 in the original function means y > 0 for the inverse function. That is why we use the positive square root.

This can be simplified a little bit to remove the minus sign from the denominator.

  f⁻¹(x) = √((3 -x)/3)

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The graph plots the function and its inverse. They are reflections of each other over the line y=x. (That's one way you can tell you have the correct inverse function.)

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3 years ago
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