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
suter [353]
3 years ago
8

Simplify the following: (r+s-t)-(r-s+t)

Mathematics
1 answer:
ArbitrLikvidat [17]3 years ago
4 0
R+s-t-(r-s+t)

=2s-t is the answer



People think this answer would be just =2s but I have verified with an online calculator and the answer that textbooks look for regarding this is 2s-t

You would assume you would go r-r and thats 0 so no r's

you would say s-(-s) makes it plus and theres 2s

and you would say -t -(+t) is -t 

that's why the answer is 2s-t

At first I also did t-(+t) and thought it would be no t's but the answer is in fact 2s-t 
You might be interested in
How many solutions does this equation have?<br><br> 8n = 10 + 10n
Andre45 [30]

Answer:

1

Step-by-step explanation:

-10n+8n=10

-2n=10

n=-5

So, one solution

5 0
2 years ago
The solution to the equation x3 = 125 is: 5 -5 ±5
AveGali [126]

Answer:

x=5

Step-by-step explanation:

x^3 = 125

Take the cubed root of each side

x^3 ^ (1/3) = 125 ^ (1/3)

x = 5

3 0
3 years ago
Which equation represents the sentence? Four more than a number is half the number.
ahrayia [7]
A. n+4=n/2

B. cannot be the answer because it is subtracting instead of adding.

C. cannot be the answer because half of the number is supposed to go after the equal sign.

D. cannot be the answer because the half of the number part did not go before adding the number. Also, it's subtracting instead of adding.


5 0
3 years ago
One year, the population of a city was 330,000. Several years later
Goshia [24]

Answer:

18% Decrease.

Step-by-step explanation:

You can use this formula for % decrease questions. :)

Decrease= Starting value (original) - Final Value (the smaller number) / starting value x 100.

Hope this helps,

Azumayay

3 0
2 years ago
Suppose that you were not given the sample mean and sample standard deviation and instead you were given a list of data for the
Troyanec [42]

Answer:

So, the sample mean is 31.3.

So, the sample standard deviation is 6.98.

Step-by-step explanation:

We have a list of data for the speeds (in miles per hour) of the 20 vehicles. So, N=20.

We calculate the sample mean :

\mu=\frac{19 +19 +22 +24 +25 +27 +28+ 37 +35 +30+ 37+ 36+ 39+ 40+ 43+ 30+ 31+ 36+ 33+ 35}{20}\\\\\mu=\frac{626}{20}\\\\\mu=31.3

So, the sample mean is 31.3.

We use the formula for a sample standard deviation:

\sigma=\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}(x_i-\mu)^2}

Now, we calculate the sum

\sum_{i=1}^{20}(x_i-31.3)^2=(19-31.3)^2+(19-31.3)^2+(22-31.3)^2+(24-31.3)^2+(25-31.3)^2+(27-31.3)^2+(28-31.3)^2+(37-31.3)^2+(35-31.3)^2+(30-31.3)^2+(37-31.3)^2+(36-31.3)^2+(39-31.3)^2+(40-31.3)^2+(43-31.3)^2+(30-31.3)^2+(31-31.3)^2+(36-31.3)^2+(33-31.3)^2+(35-31.3)^2\\\\\sum_{i=1}^{20}(x_i-31.3})^2=926.2\\

Therefore, we get

\sigma=\sqrt{\frac{1}{N-1}\sum_{i=1}^{N}(x_i-\mu)^2}\\\\\sigma=\sqrt{\frac{1}{19}\cdot926.2}\\\\\sigma=6.98

So, the sample standard deviation is 6.98.

3 0
2 years ago
Other questions:
  • The daily recommended allowance of vitamin C for six graders is 45 MG 1 orange has an about 75% of the recommended daily allowan
    14·1 answer
  • A manufacturer of cheese filled ravioli supplies a pizza restaurant chain. Based on data collected from its automatic filling pr
    8·1 answer
  • I need help with this
    13·1 answer
  • What time is 15 minutes after 6:42?
    9·1 answer
  • Find the Quotient.<br> 1,382 divided 4
    12·1 answer
  • So my mind is dead.....HELP MEEEEE!!!!!! THX PEEPS..XP
    12·1 answer
  • What is y=-3x-5 in standard form?
    8·2 answers
  • Find the greatest common factor of 15w2 and 25w3.
    11·2 answers
  • What is an equation of the line that passes through the points (5, 4) and (2, -2)?
    6·1 answer
  • Which of the following is true
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!