1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Karo-lina-s [1.5K]
3 years ago
5

What expression is equivalent to 2.2-2.5?

Mathematics
2 answers:
Pani-rosa [81]3 years ago
4 0
Hi <span>Camrynb10705oxknsv!
So let's take a look at the answers they give. A is 2.5 - 2.2 and all that is is switching the numbers so that isn't right. B they do addition instead of subtraction so that can't be right. C they do 2.2 + (-2.5) and when you add a negative number it's like subtraction because a negative number is under 0 and so your adding a number under 0 so you go down. So the answer is C.
If you need me to explain it different let me know. Hope this helps!</span>
dybincka [34]3 years ago
4 0
The answer is C. How we know:
The origional expression would equate to -0.3
The reason A is incorrect is that you can not change the order of subtraction. This answer equates to 0.3.
The reason B is incorrect is that adding is not the same as subtracting. This answer equates to 4.7.
The reason D is incorrect is that subtracting a negative is the same as adding. This would equate to 4.7
The reason C is correct is that adding negative is the same as subtracting. This would equate to -0.3.
You might be interested in
Pinky Bauer, Chief Financial Officer of Harrison Haulers, Inc., suspects irregularities in the payroll system, and orders an ins
AVprozaik [17]

Answer: 17.89

Step-by-step explanation:

In binomial distribution, the standard deviation is given by :-

\sigma=\sqrt{np(1-p)}

As per given , we have

The number of vouchers in the sample with errors is denoted by x.

p= 0.20  , n = 2000

Then , \sigma=\sqrt{2000\times(0.2)(1-0.2)}

\sigma=\sqrt{320}=17.88854382\approx17.89

Hence, the standard deviation of x is 17.89.

6 0
3 years ago
If x+ 1=23 what is the value of 3x +3?
blagie [28]
\bf x+1=23\qquad \qquad \stackrel{3(x+1)}{3x+3}\qquad \qquad \stackrel{\downarrow }{3}(x+1)=\stackrel{\downarrow }{3}(23)
8 0
3 years ago
How to solve a system of three equations with substitution
zloy xaker [14]

Answer:

Usually there are the variables x y z but it doesn't matter what they are.

Step-by-step explanation:

First choose your first variable to solve. Find x by putting all the numbers and variables to one side.

once you found x substitute the answer for x in all the equations. Next find y and substitute your answer in all the equations again.

Once you have solved 2 variables then you are able to solve z.  

If you have questions please feel free to ask in the comments below.

4 0
3 years ago
What is 1/2(4x+14)=2(x-7)
GREYUIT [131]

Answer:

no solution

Step-by-step explanation:

1/2(4x+14)=2(x-7)

Multiply both sides by 2.

4x + 14 = 4(x - 7)

4x + 14 = 4x - 28

Subtract 4x from both sides.

14 = -28

Since 14 = -28 is a false statement, there is no solution for this equation.

Answer: no solution

8 0
3 years ago
Graph the system. Tell whether the system has one solution, no solution, or infinitely many solutions. y = –2x + 1 y = –2x – 3
Alchen [17]
Let's try the actual solution of the system

<span>y = –2x + 1
y = –2x – 3

Note that the slopes of the graphs of these two lines are the same:  -2.

That means that the lines are parallel to one another.

Only the y-intercepts (1 and -3) are different.

Since the 2 lines never intersect, the system has no solution.

</span>
8 0
3 years ago
Other questions:
  • The number of possible genetically different gametes for an organism equals 2N, where N is the number of pairs of chromosomes. I
    15·2 answers
  • The slope of the line is ___.
    12·1 answer
  • Is the following statement true? <br><br> 2(4x+3y)=8x+6y
    14·1 answer
  • For similar light intensity, compact fluorescent bulbs use about 25% of the energy of incandescent bulbs. Let's say you replaced
    6·1 answer
  • The total cost to stay one night at sleepyhead motel is $119 without breakfast and $124 with breakfast included what is the diff
    5·2 answers
  • Form the algebraic expressions for the following with explanation.
    12·1 answer
  • Order the following values from least to greatest: 22.4, -28, 27, -17
    9·2 answers
  • Integrate 1/x(x-1) dx
    5·1 answer
  • Layla right her scooter 360 miles every week, she rides 60 miles every 3 hours. At this rate, how many hours will take Layla to
    9·2 answers
  • Part C Rewrite the expression from Part B to get the variable b alone on one side of the equation. (This is also called isolatin
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!