Answer:
A factor that is a prime number. In other words: any of the prime numbers that can be multiplied to give the original number. Example: The prime factors of 15 are 3 and 5 (because 3×5=15, and 3 and 5 are prime numbers).
To answer this problem, you should just substitute some figures in order to get the required amount.
So, let a be the amount of 10% iodide solution
So...
4 (3) + 10a = 6 (3+a)
[4 represents the silver iodine solution, the 3 is the liters, while we are looking for the 6% solution]
12 + 10a = 18 + 6a
10a - 6a = 18 - 12
4a = 6
a = 6/4
a = 3/2
So you will need 3/2 or 1.5 liters of 10% iodide solution.
Answer:
76
Step-by-step explanation:
The sum of the angles of a triangle add to 180
40+ 3x+10 + 2x+20 = 180
Combine like terms
70 + 5x = 180
Subtract 70
70+5x-70 =180-70
5x = 110
Divide by 5
5x/5 = 110/5
x = 22
We want to find BCA
BCA = 3x+10
= 3(22)+10
= 66+10
=76
12.
Start of with simply two times six, which is twelve. Since they're both negatives, they cancel each other out and become positive.
Hope this helps!
Vamos lá.....
Duas maneiras praticas:
1 - Multiplicar a fraçao pelo total, vai informar quanto a fracao representa (o que é questionado na questao)
2 - Regra de 3.
1:
72 × (3/8)
216/8
27
Ele acertou 27 questoes
<em>(pergunta mais que interessante: qntas questoes havia na prova??? 72)</em>