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3 years ago

Please someone help me I just have 20 minutes left

Mathematics

1 answer:

sergey [27]3 years ago

7 0

Answer:

ima say C

Step-by-step explanation:

im juss writing to it wont say its a short answer srry :)

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Which is equal to (2+3i)+(-4+i)?<br> A, -2-4i<br> B, -2-2i<br> C, -2+2i<br> D, -2+4i<br> E, 6+4i

inysia [295]

Answer:

D. -2+4i

Step-by-step explanation:

just combine like terms :)

6 0

3 years ago

Read 2 more answers

Which of the following is the correct notation for the complex number √-64-12

Liono4ka [1.6K]

The answer would be -12+8i

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3 years ago

You have D dollars to buy fence to enclose a rectangular plot of land (see figure at right). The fence for the top and bottom co

alex41 [277]

The perimeter of the rectangular plot of land is given by the expression below

$P=2x+2y$

On the other hand, since the available money to buy fence is D dollars,

$\begin{gathered} D=4(2x)+3(2y) \\ \Rightarrow D=8x+6y \\ D\rightarrow\text{ constant} \end{gathered}$

Furthermore, the area of the enclosed land is given by

$A=xy$

Solving the second equation for x,

$\begin{gathered} D=8x+6y \\ \Rightarrow x=\frac{D-6y}{8} \end{gathered}$

Substituting into the equation for the area,

$\begin{gathered} A=(\frac{D-6y}{8})y \\ \Rightarrow A=\frac{D}{8}y-\frac{3}{4}y^2 \end{gathered}$

To find the maximum possible area, solve A'(y)=0, as shown below

$\begin{gathered} A^{\prime}(y)=0 \\ \Rightarrow\frac{D}{8}-\frac{3}{2}y=0 \\ \Rightarrow\frac{3}{2}y=\frac{D}{8} \\ \Rightarrow y=\frac{D}{12} \end{gathered}$

Therefore, the corresponding value of x is

$\begin{gathered} y=\frac{D}{12} \\ \Rightarrow x=\frac{D-6(\frac{D}{12})}{8}=\frac{D-\frac{D}{2}}{8}=\frac{D}{16} \end{gathered}$ <h2>Thus, the dimensions of the fence that maximize the area are x=D/16 and y=D/12.</h2><h2>As for the used money,</h2> $\begin{gathered} top,bottom:\frac{8D}{16}=\frac{D}{2} \\ Sides:\frac{6D}{12}=\frac{D}{2} \end{gathered}$ <h2>Half the money was used for the top and the bottom, while the other half was used for the sides.</h2>

7 0

1 year ago

If branndon finishes his work at 5:00 he us at the rosewood cafe

son4ous [18]

Answer:

the question is not complete

4 0

3 years ago

Explain how you would answer 3 - (-5)

Margarita [4]

Answer:

3- (-5) + -2.

Step-by-step explanation:

Anything plus a negative number will either make that negative number go closer to zero, or turn into a positive number.

3 0

3 years ago