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mart [117]
3 years ago
9

Select all the expressions that are equivalent to 13 - x *

Mathematics
1 answer:
alina1380 [7]3 years ago
7 0

You gave no options but the simplest way to solve this is to set it equal to all of the answers to see if it is correct.

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Find the product of z1 and z2, where z1 = 5(cos 60° + i sin 60°) and z2 = 7(cos 210° + i sin 210°)
Verizon [17]

Answer:

cos210=cos(180+30)=−cos30=−√32 . sin210=sin(180+30)=−sin30=−12 . 3(cos210+isin210) =3(−√32)+3i(−12). −(32)√3−(32)i. My favourite way of seeing that sin30=12 and cos30=√32 is ...

Step-by-step explanation:

But that's what I say personally

3 0
3 years ago
Please help me out!!!!!
Neko [114]

Given:

The zeros of the polynomial are -2,\pm 5,4.

Degree = 4

Leading coefficient  = 1

To find:

The polynomial.

Solution:

If c is a zero of a polynomial, then (x-c) must be a factor of the polynomial.

Here, -2,4,-5, 5, are zeros of the required polynomial, so (x+2), (x-4), (x+5), (x-5) are factors of required polynomial.

p(x)=(x+2)(x-4)(x+5)(x-5)

p(x)=(x^2-4x+2x-8)(x^2-5^2)     [\because a^2-b^2=(a-b)(a+b)]

p(x)=(x^2-2x-8)(x^2-25)

Using distributive property, we get

p(x)=x^2(x^2-25)-2x(x^2-25)-8(x^2-25)

p(x)=x^4-25x^2-2x^3+50x-8x^2+200

On combining like terms, we get

p(x)=x^4-2x^3+(-25x^2-8x^2)+50x+200

p(x)=x^4-2x^3-33x^2+50x+200

Here, the leading coefficient is 1. So, it is the required polynomial.

Therefore, the correct option is E.

3 0
2 years ago
Letty answered 15 out of 20 questions correctly on her history quiz. What is her grade as a percent?
andriy [413]

Answer:

Letty has 75%

Step-by-step explanation:

15/20 is the same as 75/100 ( 15/20·5) so she has a 75% grade

8 0
3 years ago
Read 2 more answers
This is due in 30 minutes please answer!
BigorU [14]
X = -5.4

Hope that helped
6 0
2 years ago
Would you rather be 4’5” or 7’7”?
barxatty [35]
7’7 cuz that would be cool
8 0
2 years ago
Read 2 more answers
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