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3 years ago

Simplify (7 i) − (6 − 2i). a. −2 b. 1 − i c. 1 3i d. 4

Mathematics

1 answer:

Ksenya-84 [330]3 years ago

5 0

(7 + i) - (6 - 2i) = 7 + i - 6 + 2i = 1 + 3i

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— 4х + 7y = 20<br> у = 3х + 15

Angelina_Jolie [31]

Answer:

x=-5

Step-by-step explanation:

$-4x+7(3x+15)=20\\ -4x+21x+105=20\\ 17x+105=20\\ 17x=20-105\\ 17x=-85\\ x=-5$

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3 years ago

What are the zeros of f(x) = x2 + 2x - 80?

Lubov Fominskaja [6]

Answer:

The zeros are 8 and -10, all u have to do is substitute x for those values, factor it, or graph it.

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3 years ago

Can someone help with trig identities?<br> (calculators are allowed)

Oksana_A [137]

Answer:

Step-by-step explanation:

cosA^2 = 1 - sinA^2

subtitute 1/4 below

= 1 - (1/4)^2

= 1 - 1/16

after calculation

= - 0.9682

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2 years ago

Identify a sequence of transformations that maps triangle ABC onto triangle A"B"C" in the image below.

Murljashka [212]

Answer:

The correct option is B.

Step-by-step explanation:

It is given that triangle A"B"C" is the image of triangle ABC after transformation.

From the given figure it is noticed that the point C lies on positive y-axis and point C" lies on negative x-axis.

It means the figure is rotated either counterclockwise 90° or clockwise 270°. The rotation rule is

$(x,y)\rightarrow (-y,x)$

The corresponding sides of image A"B"C" are smaller than the preimage ABC.

$k=\frac{A"B"}{AB}=\frac{3}{6}=\frac{1}{2}$

Since k<0, therefore the transformation shows the reduction. The dilation rule is

$(x,y)\rightarrow (-\frac{1}{2}y,\frac{1}{2}x)$

$A(-3,0)\rightarrow (-\frac{1}{2}(0),\frac{1}{2}(-3))\rightarrow (0,-1.5)$

$B(3,0)\rightarrow (-\frac{1}{2}(0),\frac{1}{2}(3))\rightarrow (0,1.5)$

$C(0,5.2)\rightarrow (-\frac{1}{2}(5.2),\frac{1}{2}(0))\rightarrow (-2.6,0)$

Option B is correct.

4 0

3 years ago

Read 2 more answers

What are the last 3 shapes in 3D

katovenus [111]

Answer:

square base pyramid

triangle base pyramid

Step-by-step explanation:

second one is square bas pyramid

third one is triangle base pyramid

8 0

3 years ago

Read 2 more answers