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3 years ago

Will give brainliest

Mathematics

2 answers:

xeze [42]3 years ago

6 0

Answer:

Step-by-step explanation:

7(x - y + 3)

=> 7 × x - 7 × y + 7 × 3

=> 7x - 7y + 21

fiasKO [112]3 years ago

3 0

Answer:

$7(x - y + 3) = 7x - 7y + 21 \\ thank \: you$

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Help me I don't get it 10 points + brainliest

Tom [10]

V=2143.6
V=4/3*3.14*8^3
V=4/3*3.14*512
V=4/3*1607.7
V=6430.8/3
V=2143.6

4 0

3 years ago

If 3 * 9 + 2y = 47 what is the value of y

docker41 [41]

Answer: 10

Why?
3*9+2y=47
3*9= 27
27+2y=47
47-27= 20
2y=20
20/2=10
Y=10

Hope this helps :D

6 0

3 years ago

Convert,the complex number into polar form: 4+4i

kow [346]

Z = a + bi
z = 4 + 4i

r² = a² + b²
r² = (4)² + (4)²
r² = 16 + 16
r² = 32
r = 4√(2)
r = 4(1.414)
r = 5.656

$cos\theta = \frac{a}{r}$
$cos\theta = \frac{4}{4\sqrt{2}}$
$cos\theta = \frac{4}{4\sqrt{2}} * \frac{\sqrt{2}}{\sqrt{2}}$
$cos\theta = \frac{4\sqrt{2}}{4\sqrt{4}}$
$cos\theta = \frac{4\sqrt{2}}{4(2)}$
$cos\theta = \frac{4\sqrt{2}}{8}$
$cos\theta = \frac{\sqrt{2}}{2}$
$2(cos\theta) = 2(\frac{\sqrt{2}}{2})$
$2cos\theta = \sqrt{2}$
$2cos\theta = 1.414$

$sin\theta = \frac{b}{r}$
$sin\theta = \frac{4}{4\sqrt{2}}$
$sin\theta = \frac{4}{4\sqrt{2}} * \frac{\sqrt{2}}{\sqrt{2}}$
$sin\theta = \frac{4\sqrt{2}}{4\sqrt{4}}$
$sin\theta = \frac{4\sqrt{2}}{4(2)}$
$sin\theta = \frac{4\sqrt{2}}{8}$
$sin\theta = \frac{\sqrt{2}}{2}$
$2(sin\theta) = 2(\frac{\sqrt{2}}{2})$
$2sin\theta = \sqrt{2}$
$2sin\theta = 1.414$

z = a + bi
z = rcosθ + (rsinθ)i
z = r(cosθ + i sinθ)

z = 4 + 4i
z = 5.656cosθ + (5.656sinθ)i
z = 5.656(cosθ + i sinθ)
z = 5.656(cos45 + i sin45)

$\theta = tan^{-1}\frac{b}{a}$
$\theta = tan^{-1}\frac{4}{4}$
$\theta = tan^{-1}(1)$
$\theta = 45$

The polar form of 4 + 4i is approximately equal to 5.656(cos45 + i sin45).

5 0

3 years ago

Which of the following best describes the graph below?

aev [14]

It is D. it is not a function

3 0

3 years ago

Read 2 more answers

Solve for x. Show all your steps/work. 216x = 6x + 1

abruzzese [7]

216x-6x=1
210x=1
x= 1/210
x= 0.00476

5 0

3 years ago