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
Ann [662]
3 years ago
13

If f(x)=-x+2, find f(4)

Mathematics
1 answer:
pickupchik [31]3 years ago
5 0

Answer:

f(4)=-2

Step-by-step explanation:

f(4)=-4+2=-2

You might be interested in
PLEASE HELP WITH GRADE 11 MATH. Make sure you show the formula. Substitute values and show all mathematicall operations! show yo
Degger [83]

3x+y

x

​

 

=−3

=−y+3

​

The second equation is solved for xxx, so we can substitute the expression -y+3−y+3minus, y, plus, 3 in for xxx in the first equation:

\begin{aligned} 3\blueD{x}+y &= -3\\\\ 3(\blueD{-y+3})+y&=-3\\\\ -3y+9+y&=-3\\\\ -2y&=-12\\\\ y&=6 \end{aligned}

3x+y

3(−y+3)+y

−3y+9+y

−2y

y

​

 

=−3

=−3

=−3

=−12

=6

​

Plugging this value back into one of our original equations, say x = -y +3x=−y+3x, equals, minus, y, plus, 3, we solve for the other variable:

\begin{aligned} x &= -\blueD{y} +3\\\\ x&=-(\blueD{6})+3\\\\ x&=-3 \end{aligned}

x

x

x

​

 

=−y+3

=−(6)+3

=−3

​

The solution to the system of equations is x=-3x=−3x, equals, minus, 3, y=6y=6y, equals, 6.

We can check our work by plugging these numbers back into the original equations. Let's try 3x+y = -33x+y=−33, x, plus, y, equals, minus, 3.

\begin{aligned} 3x+y &= -3\\\\ 3(-3)+6&\stackrel ?=-3\\\\ -9+6&\stackrel ?=-3\\\\ -3&=-3 \end{aligned}

3x+y

3(−3)+6

−9+6

−3

​

 

=−3

=

?

−3

=

?

−3

=−3

​

Yes, our solution checks out.

Example 2

We're asked to solve this system of equations:

\begin{aligned} 7x+10y &= 36\\\\ -2x+y&=9 \end{aligned}

7x+10y

−2x+y

​

 

=36

=9

​

In order to use the substitution method, we'll need to solve for either xxx or yyy in one of the equations. Let's solve for yyy in the second equation:

\begin{aligned} -2x+y&=9 \\\\ y&=2x+9 \end{aligned}

−2x+y

y

​

 

=9

=2x+9

​

Now we can substitute the expression 2x+92x+92, x, plus, 9 in for yyy in the first equation of our system:

\begin{aligned} 7x+10\blueD{y} &= 36\\\\ 7x+10\blueD{(2x+9)}&=36\\\\ 7x+20x+90&=36\\\\ 27x+90&=36\\\\ 3x+10&=4\\\\ 3x&=-6\\\\ x&=-2 \end{aligned}

7x+10y

7x+10(2x+9)

7x+20x+90

27x+90

3x+10

3x

x

​

 

=36

=36

=36

=36

=4

=−6

=−2

​

Plugging this value back into one of our original equations, say y=2x+9y=2x+9y, equals, 2, x, plus, 9, we solve for the other variable:

\begin{aligned} y&=2\blueD{x}+9\\\\ y&=2\blueD{(-2)}+9\\\\ y&=-4+9 \\\\ y&=5 \end{aligned}

y

y

y

y

​

 

=2x+9

=2(−2)+9

=−4+9

=5

​

The solution to the system of equations is x=-2x=−2x, equals, minus, 2, y=5y=5y, equals, 5.

5 0
2 years ago
Math fractions subhan cut a sandwich into 8 equal pieces and ate 1 piece. he had 7/8 left subhan put each of the remaining piece
erma4kov [3.2K]
1 sandwich cut into 8 pieces then eats 1 pieces, 
then had 7/8 lefts means that 7 pieces left, if he put each mean put 1 pieces in a plate, than he need 7 plates.

When he ate 1 piece, it means that he ate 1/8 or 1 out of 8 pieces.  
he put 1/8 part of the sandwich on each plate.
8 0
3 years ago
There are 2 big dogs and 4 small dogs how many dogs are there? Use circle to solve draw to show your work . Write number sentenc
VikaD [51]

Answer:

Step-by-step explanation:

It is 6 and the sentence is 4+2

3 0
3 years ago
Read 2 more answers
The graph of a sinusoidal function intersects its midline at (0,5) and then has a maximum point at (\pi,6)
Musya8 [376]
First, let's use the given information to determine the function's amplitude, midline, and period. 

Then, we should determine whether to use a sine or a cosine function, based on the point where x=0.

Finally, we should determine the parameters of the function's formula by considering all the above.
     
                      Determining the amplitude, midline, and period 

The midline intersection is at y=5 so this is the midline. 

The maximum point is 1 unit above the midline, so the amplitude is 1. 

The maximum point is π units to the right of the midline intersection, so the period is 4 * π.
 
                            Determining the type of function to use 

Since the graph intersects its midline at x=0, we should use thesine function and not the cosine function. 

This means there's no horizontal shift, so the function is of the form -

a sin(bx)+d

Since the midline intersection at x=0 is followed by a maximumpoint, we know that a > 0.

The amplitude is 1, so |a| = 1. Since a >0 we can conclude that a=1. 

The midline is y=5, so d=5. 

The period is 4π so b = 2π / 4π = 1/2 simplified. 

f(x)1 sin 1/3x+5 = Solution
5 0
3 years ago
Which expression has the greatest value.
Snowcat [4.5K]
16 3/2 has the greatest value because if we simplify that , we get 17 1/2 which is greater than the rest :)). the first one equals 16, the third one equals 16 and the last one equals 2 to the 2nd power which is 4.
8 0
3 years ago
Other questions:
  • Assume the number of pounds of chocolate consumed in a year is equally likely between 20 and 100 pounds. what is the probability
    13·1 answer
  • What is the answer to 30divided by 6x2
    15·2 answers
  • Planes X and Y are perpendicular. Points A, E, F, and G are points only in plane X. Points R and S are points in both planes X a
    6·2 answers
  • The dot plot shows the height, in feet, of a group of trees being studied. How many trees are being studied
    10·1 answer
  • GIVEN BRAINLIEST, 5 STARS, + THANKS
    7·1 answer
  • Please help!!<br> Picture shown!
    6·1 answer
  • Can someone please help me out on this?
    15·1 answer
  • I need help and you will revieve 20 points. ​
    9·2 answers
  • Estimate the volume of a soccer ball that has a diameter of 8 inches
    10·1 answer
  • Jenny earns $5.50 per hour to babysit plus a flat fee of $10.50 for travel. If Jenny
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!