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
tia_tia [17]
2 years ago
10

Given ƒ(x) = 3x + 9, find x when ƒ(x) = 21.

Mathematics
2 answers:
Dima020 [189]2 years ago
7 0
3x + 9 = 21
3x = 12
x = 4
maksim [4K]2 years ago
6 0

Answer:

4

Step-by-step explanation:

ƒ(x) = 3x + 9; Substitute 21 for ƒ(x).

21 = 3x + 9

21 − 9 = 3x

12 = 3x → x = 4

You might be interested in
Which expression is equivalent to x-3x-(-5x)?
Katena32 [7]

Answer:

D

Step-by-step explanation:

x-3x-(-5x)=-2x+5x=3x

4 0
2 years ago
Read 2 more answers
How do you find the base and height?
dusya [7]
A triangle is 180 degrees. Depending on their angles: Right Angle - 90 degrees
Acute Angle - less than 90 degrees and Obtuse Angle greater than 90 degrees and under 180 degrees. Hope that helps. 
8 0
3 years ago
Lines l and m are parallel lines cut by the transversal line t. Which angle is congruent to ∠7?
pav-90 [236]

Answer:

<3, <2 or <6

Step-by-step explanation:

6 0
3 years ago
The explicit rule for a sequence is given. an=4n−1 What is the recursive rule for the sequence?
Gnom [1K]

Answer:

a_{n+1}=a_n+4

Step-by-step explanation:

Have in mind the definition of the term a_n=4\,n-1, and now work on what the term a_{n+1} is based on the previous definition:

a_{n+1} = 4\,(n+1)-1\\a_{n+1}=4\,n+4-1

In the next step do NOT combine the numerical values, but try to identify the a_n term (4\,n-1) in the expression (notice the use of square brackets to group the relevant terms):

a_{n+1}=4\,n+4-1\\a_{n+1}=[4\,n-1]+4\\a_{n+1}=a_n+4

So now we have the term "a_{n+1}" defined in a recursive manner based on the previous term "a_n"

8 0
2 years ago
The average of the first five multiple of 7 is
Black_prince [1.1K]

Answer:

b. 21

Step-by-step explanation:

The first five mutiples of 7 are:<em> 7, 14, 21, 28, 35. </em>You can get these by multiplying 7 to any integer.

  • 7x1 = 7
  • 7x2 = 14
  • 7x3 = 21
  • 7x4 = 28
  • 7x5 = 35

In order to get the average of these numbers, you have to add them and divide the sum to the total number of multiples.

Let's add first.

7+14+21+28+35 = 105

Let's divided 105 by 5, which is the number of the multiples of 7.

105÷5 = 21

<em>The answer is 21.</em>

7 0
3 years ago
Other questions:
  • H-9&lt;1.3= What is the answer to this problem
    11·1 answer
  • is the sum of two polynomials of degree 5 always a polynomial of degree 5? Give an example to explain your answer
    10·1 answer
  • selling baseball cards for $4 a card and buying baseball cards for $6 a card. If you started the day with $200, how much money d
    14·1 answer
  • If you dig a 12 feet hole and you cover up that hole how deep is that hole
    15·2 answers
  • How do you estimate an irrational vsquare root? Use COMPLETE sentences! Make sure you use LOTS of details. Word Bank Square Root
    13·1 answer
  • You wonder if one's age is independent of whether or not one's willingness to wear masks in public. You ask 100 people whether t
    14·1 answer
  • Find an equation of the line containing the point (2,-5) and parallel to y = – 4x – 2.
    9·1 answer
  • Anthony Tedesco sold his used mountain bike and accessories for $140. If he received 4 times as much money for the bike as he di
    8·2 answers
  • What is the value of the expression 11 + (fraction 1 over 2)4 ⋅ 48?
    9·1 answer
  • If a translation maps ∠I onto ∠K, which of the following statements is true?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!