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Vinil7 [7]
3 years ago
6

F(x) = -2x + 9, find x if f(x) = 23

Mathematics
1 answer:
JulijaS [17]3 years ago
7 0

Answer:

x = -7

Step-by-step explanation:

f(x) = -2x + 9

f(x) = 23

therefore, f(x) =

-2x + 9 = 23

     -2x = 23 - 9

     -2x = 14

       -x = 14 ÷ 2

       -x = 7

        x = -7

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Solve a) 2(x+3)=x-4 b) 4(5x-2)=2(9x+3)
Nat2105 [25]

Answer:

a) -10 b) 7

Step-by-step explanation:

a) 2(x+ 3) = x - 4

2x + 6 = x - 4

2x - x = -6 - 4

x = -10

b) 4(5x - 2) = 2(9x + 3)

20x - 8 = 18x + 6

20x - 18x = 6 + 8

2x = 14

x = 14/2

x = 7

5 0
3 years ago
Read 2 more answers
Help with maths question please
mars1129 [50]
<h3>✽ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ✽</h3>

➷ Substitute -3 into g(x)

g(-3) = 2(-3) + 4

Solve:

g(x) = -2

Substitute this value into f(x)

f(-2) = 3(-2)^2

Solve:

f(-2) = 12

The answer is B. 12

<h3><u>✽</u></h3>

➶ Hope This Helps You!

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6 0
3 years ago
Need help with this problem ,please and THANK YOU :)
KiRa [710]

Answer:

A

Step-by-step explanation:

8 0
2 years ago
SKIP # 14 SHOW ALL WORK PLEASE AND I WILL GIVE BRAINLY AND 77 points for it
babunello [35]

Answers:

11. 48%

12. 25%

13. 36%

15. 93%

16. 99%

17. 0.16%

18. 160%

19. 85%

Work for 19:

The chart is incorrect because it calculates 40% of 34 instead of 40 percent of x (we got 85% for our answer but I'm using x as the unknown number) results in the number of 34.

Percentage of 40% of what number = 34?

40% of what number = 34 is equivalent to: 40% × ? = 34

--------------------------

40% × ? = 34

? =

34 ÷ 40% =

34 ÷ (40 ÷ 100) =

(100 × 34) ÷ 40 =

3,400 ÷ 40 =

85

Proof:

If 40% × 85 = 34 =>

Divide 34 by 85...

... And see if we get as a result: 40%

----------------------------------------------------------

20. 21 students

Step-by-step explanation:

I hope I helped, and I always appreciate brainliest!!! ;)

6 0
2 years ago
Will give Brainliest!
Oduvanchick [21]

Answer:

<em><u>y = d + a · cos(bx - c) ⇒ y = -4cos(4/3x)</u></em>

  • a = -4
  • b = 4/3
  • c = 0
  • d = 0

Amplitude = |a| = |-4| = 4

Period = \frac{2\pi }{b} =\frac{2\pi }{\frac{4}{3} } =2\pi *\frac{3}{4} =\frac{3}{2} \pi

8 0
3 years ago
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