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3 years ago

Evaluate the expression 4-7i/7+4i

Mathematics

2 answers:

JulijaS [17]3 years ago

6 0

The answer is negative i because they cancel each other out except for the i

vladimir1956 [14]3 years ago

4 0

Multiply by (7−4i)/(7−4i) to make the denominator of (4−7i)/(7+4i) real.
(4−7i/7+4i)(7−4i/7−4i)

Expand (7+4i)(7−4i) using the FOIL Method.
(4−7i)(7−4i)/7(7)+7(−4i)+4i(7)+4i(−4i)

Simplify.
(4−7i)(7−4i)/65

Expand (4−7i)(7−4i) using the FOIL Method.
4(7)+4(−4i)−7i(7)−7i(−4i)/65

Simplify each term.
28−16i−49i−28/65

Simplify
−65i/65

−i

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To get the 10% discount, a shopper must spend no less than $500. Use d to represent the spending (in dollars) of a shopper who g

Ganezh [65]

Answer:

Hope this helps

Step-by-step explanation: we know that

To get the 10% discount, a shopper must spend at least $200

Let

d ------> represent the spending (in dollars) of a shopper who gets the discount

therefore

The value of d must be greater than or equal to $200

i would say that d is greater

3 0

3 years ago

G prove that limx→∞(x 2 + 1)/x2 = 1 using the definition of limit at ∞.

Maslowich

$\displaystyle\lim_{x\to\infty}\frac{x^2+1}{x^2}=1$

means to say there is some number $M$ for which any choice of $\varepsilon>0$ such that

$x>M\implies\left|\dfrac{x^2+1}{x^2}-1\right|$

Working backwards, we have

$\left|\dfrac{x^2+1}{x^2}-1\right|=\left|1+\dfrac1{x^2}-1\right|=\dfrac1{x^2}$
$\implies\sqrt{\dfrac1{x^2}}$

So, whenever $x>M=\dfrac1{\sqrt\varepsilon}$ , we can always guarantee that $\left|\dfrac{x^2+1}{x^2}-1\right|$ .

7 0

3 years ago

Give Area of a circle of diameter of 120 meters

Valentin [98]

Answer:

Area=11,309.73

Step-by-step explanation:

area of a circle is πr^2 so half of the diameter is the radius so it's 60.

pi x 60^2= 11,309.73

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3 years ago

If You Had Three Wishes, What Would You Wish For?

yawa3891 [41]

Answer:

I would wish to be the brainliest, I would wish for more points, and i would wish for more people to answer my questions

Step-by-step explanation:

thats only for brainly though

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3 years ago

Holii necesito ayuda lo más rápido posible x fiiiis

Archy [21]

Usando proporciones, en conjunto con multiplicación cruzada, encontra-se que el valor de p es de 6.

<h3>¿Qué es una proporción?</h3>

Una proporción es una fracción de la cantidad total, e puede ser encontrada aplicando una regla de três.

En este problema, relación es dada por:

$\frac{p}{p+2} = \frac{6}{8}$

Aplicando multiplicación cruzada:

8p = 6(p + 2)

8p = 6p + 12

2p = 12

p = 12/2

p = 6.

Puede-se aprender más a cerca de proporciones en brainly.com/question/24615636

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2 years ago