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Tatiana [17]
3 years ago
7

Given ƒ(x) = −3x + 21, find x when ƒ(x) = 6. A) −2 B) 3 C) 5 D) 7

Mathematics
1 answer:
vagabundo [1.1K]3 years ago
7 0

Answer:

x = 5

Step-by-step explanation:

We have,

f(x) = -3x + 21 .....(1)

It is required to find x when the value of f(x) = 6

Put f(x) = 6 in equation (1) such that we get :

6 = -3x + 21\\\\3x=21-6\\\\3x=15\\\\x=5

The value of x is 5 if f(x) = 6.

You might be interested in
3 to the 4th power + 2 ⋅ 5 =
Mandarinka [93]
Hello,

The answer is "x=91".

Reason:

First write the equation:

3^4+2*5=

Now use PEMDAS:

E goes first:

3^4=3*3*3*3=81

81+2*5

M goes next:

2*5=10

81+10=

Now use A:

81+10=91

x=91

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit
4 0
3 years ago
I'm in 7th grade and need help have a final tomorrow
inna [77]
I can maybe help, what's the question
7 0
4 years ago
2x + 4y = 14 and 3x - 4y = -39
miskamm [114]

Answer:

x = 1 y= 3

Step-by-step explanation:

Multiply each equation by the value that makes the coefficients of y opposite.

Simplify.

Add the two equations together to eliminate y from the system.

Divide each term by 8 and simplify.

Substitute the value found for x into one of the original equations, then solve for y.

The result can be shown in multiple forms.

Point Form:

(1,3)

Equation Form:

x=1 ,y=3

.

7 0
3 years ago
If f(x)= 5x+4 and g(x)= -2+1...... 1) f(6) + g(-8) = ? 2) g(4)= ? 3) f(-2)= ? PLZ PLZ PLZ HELP ME I AM SOOOOO CONFUSED!!!!!!!!!!
MakcuM [25]

Answer:

See below.

Step-by-step explanation:

So we have the two functions:

f(x)=5x+4\text{ and } g(x)=-2x+1

1)

First, find the values of each function:

f(x)=5x+4\\f(6)=5(6)+4\\f(6)=30+4=34

g(x)=-2x+1\\g(-8)=-2(-8)+1\\g(-8)=16+1=17

Therefore:

f(6)+g(-8)\\=(34)+(17)=51

2)

Plug in the number into the function:

g(x)=-2x+1\\g(4)=-2(4)+1=-8+1=-7

3)

Like the last one:

f(x)=5x+4\\f(-2)=5(-2)+4=-10+4=-6

8 0
4 years ago
Pls answer this math question. In a given class 12 students have cats, 15 have dogs, and 6have both. There are nine students wit
Over [174]
Working step by step I first see all my different groups then add them all together
so
12 - cats
15 - dogs
6 - both
9 - neither

12 students + 15 students + 6 students + 9 students = 42 students
therefore 42 students are in the class

16 + 10 + 3 + 12 = 41

I’m sorry if i got it wrong!
5 0
4 years ago
Read 2 more answers
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