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Dafna11 [192]
1 year ago
7

Yes I'm available so

Mathematics
1 answer:
liraira [26]1 year ago
8 0
\begin{gathered} \frac{2+2i}{5i}=\frac{2+2i}{5i}\times\frac{5i}{5i}=\frac{5i(2+2i)}{(5i)^2}=\frac{10i-10}{-25}=\frac{2}{5}-\frac{2}{5}i=0.4-0.4i \\  \\  \end{gathered}

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Ana ha comprado libros, todos del mismo precio, por valor de 120 euros. El librero le regala 3 libros por lo que cada libro le c
lidiya [134]

Answer:

El primer paso será darle un nombre a nuestras variables:

x= Numero de libros comprados inicialmente

y=Precio inicial de los libros

Ahora analizamos el enunciado,

Lorena ha comprado libros todos del mismo precio por valor de 120 €

x*y=120 € (1)

El librero le regala 3 libros por lo que en realidad cada libro que cuesta 2 € menos

(x+3)(y-2)=120€ (2)

Tenemos entonces dos ecuaciones con dos incógnitas, así que podemos resolver,

Despejamos en (1)

x=120/y

Sustituimos en (2)

(120/y +3)(y-2)=120

120 - 240/y + 3y -6 =120

3y-240/y =120-120+6

3y -240/y =6

y- 80/y=6

y²-80=6y

y²-6y-80=0

Resolvemos la ecuación de segundo grado

a=1

b=-6

c=-80

Aplicando la resolvente,

(6+- √36+320)/2

6+-√356/2

(6+-18,86)/2

Como el valor de y no puede ser negativo la unica respuesta válida será:

y=12,43

Cada libro le costo 12,43€

Sustituyendo en (1)

x=120/12,43

x=9,65 como no puede ser un número racional

x=9

Lorena ha comprado 9 libros

6 0
3 years ago
Please help me with this question i have none clue, if you could draw it is greatly appreciate!
Mila [183]

Answer:

whats the question??

Step-by-step explanation:

7 0
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Simplify this expression 7x(9x^2)
prisoha [69]
 7x • 32x<span>2
</span><span> 2.1 </span><span> x1</span><span> multiplied by </span><span>x2 = x(1 + 2) = x<span>3
</span></span>Answer: (7•32x3)
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3 years ago
Evaluate. 1+5⋅32 8 9 16 18
Step2247 [10]
Evaluate the numerator:
1+5*3
1+15
16

Then divide it by the denominator
16/2=8

Final answer: A 8
8 0
4 years ago
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Central Subs made 27 sandwiches using 12 pound of turkey. How much turkey was used per sandwich
Finger [1]
27 divided by 12= 2.25 so 2.25 turkey was used in each sandwich. 
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