Ask question

Ask question

All categories

2 years ago

12

3x - 9 + 4x Please Help

2 answers:

Wewaii [24]2 years ago

7 0

Answer:

Add like terms 7x - 9

Step-by-step explanation:

Sveta_85 [38]2 years ago

7 0

Add the 4 and 3 then you will get

7x-9

You might be interested in

8.6E-10 in standard form

Afina-wow [57]

65 is the asnwer hope i helped

6 0

3 years ago

Is this a Percent Increase or Decrease Problem?

nydimaria [60]

Answer:

Percent Decrease

<h2>Please mark as brainliest for further answers :)</h2>

3 0

2 years ago

Help please giving Brianlest

zloy xaker [14]

Answer:

Maybe the answer will be C. P ( A and B )

7 0

1 year ago

Read 2 more answers

Hoochie [10]

C might be the answer

7 0

3 years ago

A rancher wishes to build a fence to enclose a rectangular pen having area 24 square yards. Along one side the fence is to be ma

Gnoma [55]

Answer:

The value is $C \approx \$76$

Step-by-step explanation:

From the question we are told that

The area of the rectangular pen is $A = 24 \ yard^2$

The cost of material used to make one side is $z = \$ 6$

The cost of material used to make the other sides is $r = \$ 3$

Now , the fence to be build around the rectangular pen has four sides, the first opposite sides are equal, let assume each of the to be x yard and the other opposite sides are also equal as well let assume of the to be y yard

So the cost is mathematically represented as

$C = zx + r (x + 2y )$

=> $C = 6x + 3(x + 2y)$

=> $C = 9x + 6y$

Now the area of the fence is mathematically represented as

$A = x* y = 24$

=> $y = \frac{24}{x}$

=> $C = 9x + 6[\frac{24}{x} ]$

=> $C = 9x + [\frac{144}{x} ]$

Now differentiating

$C' = 9 + 144* (-2) x^{-2}$

$C' = 9 - 288x^{-2}$

At minimum $C' = 0$

So

$9 - 288x^{-2} = 0$

$x^{-2} = 0.03125$

$x = \sqrt{\frac{1}{0.03125} }$

$x = 5.66$

Now substituting for x in the equation above to obtain minimum cost

$C = 9(5.66) + [\frac{144}{5.66} ]$

$C \approx \$76$

8 0

3 years ago