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inysia [295]
2 years ago
8

Given ƒ(x) = 3x + 9, find x when ƒ(x) = 21. A) 3 B) 4 C) 7 D) 10

Mathematics
2 answers:
docker41 [41]2 years ago
7 0
X=21
21-9=12
3x=12
12divided by 3=4
X=4. The answer is B
Alborosie2 years ago
6 0

Answer:

B

Step-by-step explanation:

Replacing <em>f</em>(x) with 21, this is the equation

21=3x+9

First, subtract 9 from each side of the equation to get:

12 = 3x

Next, divide each side by 3 to get:

4 = x

So the answer is B.

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Find the slope given points (3,2) (4,7)
snow_lady [41]

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Have a nice day! :)

6 0
2 years ago
4 people can trim a hedge in one hour.
Pani-rosa [81]
4 people in 60 minutes =
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6 0
2 years ago
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The polynomial of degree 3, P(x), has a root of multiplicity 2 at x=4 and a root of multiplicity 1 at x=−2. The y-intercept is y
Sedbober [7]

Answer:

Step-by-step explanation:

P(x) = a(x - 2)2(x + 4), a ≠ 0

 

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a = -10/20 = -1/2

 

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You can expand this if you wish

8 0
3 years ago
When 3 times a number is subtracted from 10, the result is the sum of the number and 22
Arada [10]

Answer:

x = -6

Step-by-step explanation:

Let the number be x

<u>Condition:</u>

=> 10-3x = x+22

<u><em>Let's Solve it:</em></u>

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=> -2x = 12

<em>Dividing both sides by -2</em>

=> x = -6

6 0
3 years ago
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