Answer:
7) b
8) b
9) a
10) d
11) a
12) a
Step-by-step explanation:
Responder:
Número total de bolas = 245/23
Explicación paso a paso:
Dado que:
Bolas blancas = 1/5
Bolas negras = 1/7
Bolas rojas = 7
Sea el número total de bolas = x
Bolas blancas = 1 / 5x
Bolas negras = 1 / 7x
Por tanto, total;
(x / 5 + x / 7 + 7) = x
((7x + 5x) / 35) +7 = x
(12x / 35) + 7 = x
7 = x - 12x / 35
7 = (35x - 12x) / 35
7 = 23 veces / 35
245 = 23x
x = 245/23
Answer is in a photo. I can only upload it to a file hosting service. link below!
Answer:
|-4|, |-4 1/4|, 4 1/2, 4 3/4
Step-by-step explanation:
The absolute value lines, | |, make the value inside of them positive. For example, the absolute value of -2 is 2. In this example, although -4 and -4 1/4 become positive, they are still lower than 4 1/2 and 4 3/4.
Answer is 
dm².
In order to calculate the area of the board that can be seen, we need to calculate the area of the the rectangular board and the circular frame. The difference of both's area is the required answer.
Refer to the attachment for step by step solution. :)
