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4 years ago

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

Mathematics

1 answer:

vlabodo [156]4 years ago

7 0

Answer:

Step-by-step explanation:

(6 + 2i)(6 – 2i) = 36 – 4i²

= 36 + 4 = 40

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Don’t answer if you don’t know! Your question and account will be reported!

Mkey [24]

Answer:You can divide 54.50 by just 20% with it being 272.5

Step-by-step explanation: You can use it be fraction by dividing it by 20 then you have 2.725 which is the answer.

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3 years ago

The sum of seven angles of an octagon is 132 degrees each. Find the measure of the eighth angle.

Sauron [17]

the sum of the angles in an ngon (a polygon with n sides) is (n-2)*180

so an octagon has 8 sides and has a sum total of (8-2)*180=1080 degrees

if each of 7 angles is 132, then 1080=?+7*132

1080=?+924

156=?

the 8th angle is 156 degrees

6 0

4 years ago

Solve this equation for s: r=s-t

dangina [55]

Add 't' to both sides. t+r=s

Step-by-step explanation:

6 0

3 years ago

Find the domain of the function using interval notation.<br> <img src="https://tex.z-dn.net/?f=f%28x%29%3D8%5Csqrt%7Bx-9%7D" id=

Irina18 [472]

Answer:

D_{f(x)} = [9, \infty)

Step-by-step explanation:

Here we have the square root of a function, in the following format:

$f(x) = \sqrt{g(x)}$

For the square root, and roots of even numbers(root of 4, 6, ...), we have the following condition in the domain

$g(x) \geq 0$

In this problem, we have that:

$f(x) = 8\sqrt{x-9}$

$x - 9 \geq 0$

$x \geq 9$

So the domain is

$D_{f(x)} = [9, \infty)$

3 0

3 years ago

Please help IDK how to do this!

olya-2409 [2.1K]

For this problem you must do Pythagorean theorem:

$a^{2} + b^{2} =c^{2}$

In this example 10ft is c and 7ft is a (or it could be b, and you'll be solving for a instead of b. It's the same thing, since a and b are both legs)

Plug what you know into the equation:

$7^{2} +b^{2} = 10^{2}$

49 +b^{2} = 100

Bring 49 to the right side by subtracting it:

b^{2} = 51

Now you still must isolate b. The opposite of squaring is taking the square root so take the square root of both sides to cancel it from the left side:

$b =\sqrt{51}$

b = 7.1414

b ≈ 7 ft

Hope this helped!

3 0

4 years ago