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kramer
3 years ago
5

Given k(x) =x^3-2x, find k (3)

Mathematics
1 answer:
nadezda [96]3 years ago
5 0

Answer:  21

Step-by-step explanation:

k(x) =x^3-2x

k(3) =3^3-2*(3)

k(3) =27-6

k(3) = 21

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Classify the real number(natural,whole,integer,rational,irrational).
Ede4ka [16]

Answer:

Racional porque sua raiz é igual a 7.

Step-by-step explanation:

5 0
3 years ago
An electrical power plant burns 285 barrels of oil each day to
frosja888 [35]

Answer:

11970 barrels of oil

Step-by-step explanation:

1 day use 285 barrels of oil

6 weeks = 6*7 = 42 days

42 days use: 42 * 285 = 11970 barrels of oil

Hope this help you :3

8 0
3 years ago
Sketch and write the equation for each line : y = mx<br> +b
snow_lady [41]

Answer:

equation  y =7/4x+1

slope = 7/4

Step-by-step explanation:

We have two points so we can find the slope

m =(y2-y1)/ (x2-x1)

   = (4--3)/(2--2)

  = (4+3) / (2+2)

   = 7/4

We know the slope and the y intercept

We can write the equation using y = mx+b where m is the slope and b is the y intercept

y= 7/4x +1

We put at dot at (0,1) and then go up 7 and to the right 4 .  We put another dot

Connect the dots and we have our line.

We could also put dots at (-2,-3) and (2,4) and connect the dots.

7 0
3 years ago
What is the simplified form of the following expression? 2√27+√12-3√3-2√12
LiRa [457]

Answer:

√3

Step-by-step explanation:

The given expression to be simplified is

2 \sqrt{27}+\sqrt{12}-3\sqrt{3}-2 \sqrt{12}

but

2 \sqrt{27}=2\sqrt{9 \times 3}=2 \times \sqrt{9}\times \sqrt{3}=2 \times 3 \times\sqrt{3}=6 \sqrt{3}

\sqrt{12}=\sqrt{4\times3}= \sqrt{4}\times \sqrt{3}=2\sqrt{3}

Since √12=2√3,this implies that,

2\sqrt{12}=2\times2\sqrt{3}=4 \sqrt{3}

Therefore,

2 \sqrt{27}+\sqrt{12}-3\sqrt{3}-2 \sqrt{12}=6\sqrt{3}+2\sqrt{3}-3 \sqrt{3} -4\sqrt{3}

=(6+2-3-4)\sqrt{3}

=\sqrt{3}

The simplified form of ,

2 \sqrt{27}+\sqrt{12}-3\sqrt{3}-2 \sqrt{12} is √3

8 0
3 years ago
Please help me with a explanation
blagie [28]

Answer:

x = -3   or   x = 3

Step-by-step explanation:

Subtract 9 from both sides.

x^2 - 9 = 0

Factor the left side. There is no common factor of the terms. It is a binomial which is the difference of two squares, so it factors into the product of a sum and a difference.

(x + 3)(x - 3) = 0

Set each factor equal to zero.

x + 3 = 0   or   x - 3 = 0

Solve each equation.

x = -3   or   x = 3

3 0
3 years ago
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