Answer:
949
Step-by-step explanation:
If the 3 digit number is rounded to 900, then this number is between 900 and 950.
The digit in the ones place is the fifth odd number begginning with 1, so this number is number 9.
Lastly, the sum of digits is 22.
Putting our number as 9x9, where x is the tens digit, we know that 9 + x + 9 = 22, so we have that x = 4
So, our number is 949
You can use permutations when order matters and use combinations when order doesn’t matter.
Answer:
La calculadora y el cuaderno costaba 9 y 1,8 euros hace tres días.
Step-by-step explanation:
A partir del enunciado podemos construir el sistema de ecuaciones lineales:
Hace tres días:
(1)
Actualmente:
(2)
Donde:
- Precio de la calculadora.
- Precio del cuaderno.
Por métodos algebraicos, tenemos que el sistema de ecuaciones tiene la siguiente solución:
, 
La calculadora y el cuaderno costaba 9 y 1,8 euros hace tres días.
Answer:
The variable y = 2.100
Step-by-step explanation:
Here, we are told to solve for the variable y.
We are asked to use the segment addition postulate. In summary, the postulate is of the opinion that given 3 points X,Y and Z, we can only say that these 3 points are collinear(lie on the same line) if they obey the formula below;
XZ = XY + YZ
Now, we have that S is between R and T.
Mathematically that means;
RT = RS + ST
from the question, we are told that RT = 26, RS = 9y-2 and ST = y + 7
Now, insert these values into the alphabetical equation;
26 = (9y-2) + (y + 7)
26 = 9y-2 + y + 7
26 = 9y+y -2 + 7
26 = 10y + 5
26-5 = 10y
10y = 21
y = 21/10
y = 2.1
Which is y = 2.100 to three decimal places
