Answer:
72 degrees
Step-by-step explanation:
180-45-63=72
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
Answer:
a. 2
Step-by-step explanation:
Answer:
the integers are -28 and -29
Step-by-step explanation:
Lets do math:
When i was little this was hard but now its pretty easy
look two consecutive numbers are like 1, 2, 3, their difference is usually 1
our equation looks like this:
-57=x+(x-1)
we add 1 to both sides and get:
-56=2x
divide by 2 because im smart
-28=x
thats one number but how 'bout the other one?
we just have to subtract 1 and get -29
the end.
I did it with "tries & mistakes" method:
n is not 1, because LCM of 1 and 6 is 6
n is not 2, because LCM of 2 and 6 is 6
n is not 3, because LCM of 3 and 6 is 6
n is not 4, because LCM of 4 and 6 is 12
n is not 5, because LCM of 5 and 6 is 30
n is not 6, because LCM of 6 and 6 is 6
n might be <u>7</u>, because LCM of 7 and 6 is what we're looking for - 42.
n might be also <u>14</u> or <u>21</u> - so these are all multiplies of 7 which are less or equal to half of 42.
I hope it helps :)
