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Zarrin [17]
3 years ago
12

Given that f(x)=2x-1, find f(3)

Mathematics
1 answer:
Dennis_Churaev [7]3 years ago
7 0

Answer:

  5

Step-by-step explanation:

Put 3 where x is and do the arithmetic.

  f(x) = 2x -1

  f(3) = 2·3 -1 = 6-1

  f(3) = 5

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15 points work out ratio for x
BlackZzzverrR [31]

Answer:

x = 25

Step-by-step explanation:

x : (x+10) = 5:7

Fractional form

x / x+10 = 5/7

Cross multiply:

x * 7 = (x+10) * 5

7x = 5x + 50

7x - 5x = 5x + 50 - 5x

2x = 50

x = 25

Check:

25 : 25 + 10

25 : 35

25/35 = 5/7

If my answer is incorrect, pls correct me!

If you like my answer and explanation, mark me as brainliest!

-Chetan K

7 0
3 years ago
Choose the solution(s) of the following system of equations x2 + y2 = 6 x2 – y = 6
ElenaW [278]
<h2>Answer</h2>

x=\sqrt{6}, y=0\\ x=-\sqrt{6} , y=0\\x=\sqrt{5} , y=-1\\x=-\sqrt{5} , y=-1

Or as ordered pairs: (\sqrt{6} ,0),(-\sqrt{6} ,0),(\sqrt{5} ,-1),(-\sqrt{5} ,-1)

<h2>Explanation</h2>

Lets solve our system of equations  step by step

x^2+y^2=6 equation (1)

x^2-y=6 equation (2)

1. Solve for x^2 in equation (2)

x^2-y=6

x^2=6+y equation (3)

2. Replace equation (3) in equation (1) and solve for y

x^2+y^2=6

6+y+y^2=6

y^2+y=0

y(y+1)=0

y=0 or y=-1

3. Replace the values of y in equation (3) and solve for x

- For y=0

x^2=6+y

x^2=6

x=\sqrt{6} or x=-\sqrt{6}

- For y=-1

x^2=6+y

x^2=6-1

x^2=5

x=\sqrt{5} or x=-\sqrt{5}

So, the solutions of our system of equation are:

x=\sqrt{6}, y=0\\ x=-\sqrt{6} , y=0\\x=\sqrt{5} , y=-1\\x=-\sqrt{5} , y=-1

6 0
3 years ago
Read 2 more answers
Can someone help with this please?
ipn [44]

7^2=7\cdot7=49\\\\8^2=8\cdot8=64\\\\\sqrt{49}

3 0
2 years ago
Read 2 more answers
Calculate the sum. 1.075 + 27.105 *
Molodets [167]
I believe the answer is 28.18
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2 years ago
−1/3 −(−1/2)<br><br> Brainliest for the right answer
lawyer [7]

The answer would be -1/6 or -0.166667

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3 years ago
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