Answer:
Step-by-step explanation:
Given expression:
To evaluate the expression.
Solution.
The values are
Let 
-----------1
Multiplying 10 both sides.
----------2
Subtracting 1 from 2.
-
-------------------------------------------
Dividing both sides by 9.
Let 
Multiplying both sides by 100
------------3
Multiplying 1000 both sides.
----------4
Subtracting 3 from 4.
- 
-------------------------------------------
Dividing both sides by 900.
So, we can evaluate the given expression as:
⇒
⇒ 
⇒ 
Taking LCD = 900
⇒ 
⇒ 
Adding numerators.
⇒ 
⇒ 
⇒ 
(Answer)
Answer:
I'm pretty sure the answer is 2, (3/2)
Answer:
4. D
11. B
12. C
16. D
17. A
Step-by-step explanation:
Answer:
45 = (one third)x + 15
Step-by-step explanation:
If x represents the number of minutes Tom commutes, then (1/3)x is "one-third as many minutes as Tom's commute." 15 minutes more than that is ...
(1/3)x + 15
We are told this is the length of Paul's commute, and that it is 45 minutes. So, the appropriate equation is ...
45 = (1/3)x +15
Answer:
Step-by-step explanation:
As an example, iodine-131 is a radioisotope with a half-life of 8 days. It decays by beta particle emission into xenon-131. After eight days have passed, half of the atoms of any sample of iodine-131 will have decayed, and the sample will now be 50% iodine-131 and 50% xenon-131.
50 grams to 25 grams is one half-life. 25 grams to 12.5 grams is another half-life. So, for 50 grams to decay to 12.5 grams, two half-lives, which would take 36 days total, would need to pass. This means each half-life for element X is 18 days.
