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3 years ago

Multiply 6+2i and it’s conjugate. Simplify. Help me please ASAP

Mathematics

1 answer:

vlabodo [156]3 years ago

7 0

Answer:

Step-by-step explanation:

(6 + 2i)(6 – 2i) = 36 – 4i²

= 36 + 4 = 40

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Find variable y<br> : -90=5y-20

NeTakaya

-90= 5y-20

-90+20= 5y-20+20

-70=-5y

-70/-5= -5y/-5

y= 14

7 0

3 years ago

Solve the system by graphing: y=-3x-3 and y=2x+2. Make sure you write your answer as an ordered pair: (x,y)

Rainbow [258]

Answer: (5, 12)

Step-by-step explanation:

Just graph the linear equations and find where they intersect.

Algebraically, you can set them equal to each other

-3x-3=2x+2

-x-3=2

-x=5

x=5

Plug x=5 to any equation

y=2(5)+2

y=12

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3 years ago

695 -7x = 140<br> What is the value of x?

Sphinxa [80]

Hello!

695 - 7x = 140

-7x = 140 - 695

-7x = -555

-x = -79.29

x = 79.29

I hope this helps you! Have a lovely day!

- Mal

5 0

3 years ago

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A rectangle with a perimeter of 19m^2+2m-10 and a width of m^2 write an expression for the lenght

never [62]

Answer: $\frac{17}{2}m^2+m-5$

Step-by-step explanation:

By definition, the perimeter of a rectangle is:

$P=2l+2w$

Where "l" is the lenght and "w" is the width.

If you solve for "l":

$P-2w=2l\\\\l=\frac{P-2w}{2}$

In this case, you know that the following expression represents the perimeter of the rectangle:

$19m^2+2m-10$

And the width of that rectanle is represented wih this expression:

$m^2$

Therefore, based on the explained above, you can conclude that the lenght of that rectangle is given by:

$\frac{19m^2+2m-10-2(m^2)}{2}$

Finally, simplifying the expression, you get:

$=\frac{17m^2+2m-10}{2}=\frac{17}{2}m^2+m-5$

8 0

3 years ago

My question is in the picture pls help

zaharov [31]

Answer:

B. 7 cm

Step-by-step explanation:

4 0

3 years ago

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