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Arlecino [84]
2 years ago
9

All of the following expressions are equivalent except _____. 1.x - 7 2. 7 + (- x) 3. - x + 7 4. 7 - x

Mathematics
1 answer:
Elena L [17]2 years ago
4 0

Answer:

x-7

Step-by-step explanation:

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What's the difference between adding two rational number and get a negative number
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Comparing two rational numbers

Use fraction form:

 

Make the denominators the same and compare the numerators. The number with the smaller numerator is smaller. For example, to compare a/b and c/d, we rewrite

 

a/b=a*d/b*d

  = ad/bd and c/d = c*b/d*b=bc/bd

 

Now just compare the numerators : "ad" and "bc"

 

Multiplying and Dividing Rational Numbers 

 

Multiplying and dividing rational numbers in decimal form is the same as multiplying and dividing integers. The decimal place of the product is the same of all decimals of all multiplied numbers. For example, 3.12*2.4.

 

Solution => 3.12*2.4=7.488

 

When multiplying or dividing rational numbers in fractional form, you multiply the numerators (N*N) and then multiply the denominators (D*D).

 

When dividing rational numbers in fractional form, first take the reciprocal of the divisor, and then multiply the numerators and the denominators.

 

Example => 5/9 divided by 2/7 .

 

Solution => 5/9 * 7/2 =  35/18

 

 

Adding Rational numbers

 

Adding and Subtracting rational numbers in decimal form is the same as adding and subtracting integers.

 

Example => -3.54+2.79=-0.75

 

When adding or subtracting rational numbers in fractional form, first make the denominator equal, and then add or subtract the numerators. 

6 0
3 years ago
At a video arcade action video games usually cost $12.50. This week they are on sale for 30% off. What is the sale price of the
Juliette [100K]

Answer: 8.75


Step-by-step explanation:

12.50 x 30% or .03

= 3.75

3.75 - 12.50

= 8.75

5 0
2 years ago
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Round to the nearest tenth Pythagorean Theorem
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I think 8.0 is the answer
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3 years ago
Solve:<br> 0.03g - (2g + 3) = 1.8
wel

Answer:

-2.43655

Step-by-step explanation:

3 0
3 years ago
The two-way table shows the number of books of each type in Eliza's home ​what is the probability that a randomly selected refer
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Answer:

B. 0.4

Step-by-step explanation:

Use the definition of the probability

Pr=\dfrac{\text{Number of all favorable outcomes}}{\text{Number of all possible outcomes}}

You have to find the probability that a randomly selected reference book is hard cover. Hence, from the table

  • Number of all possible outcomes = Number of Reference books = 25
  • Number of all favorable outcomes = Number of Hardcover Reference books = 10

So, the probability is

Pr=\dfrac{10}{25}=\dfrac{40}{100}=0.4

6 0
3 years ago
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