Answer:
First, let's find out the sum;
1.30 + 1.25 = 2.55, is rational, so A
Step-by-step explanation:
The reason being this is because, 2.55 is a terminating decimal meaning that the decimal place does not go on forever.
Answer:
2 minutes
Step-by-step explanation:
The front of the train enters the tunnel and travels 1 km before the rear of the train enters the tunnel. Thus, the total distance traveled by the front of the train is 2 km, and this is covered in a certain number of hours:
Since distance = rate times time, time = distance / rate. In this particular case we have:
2 km
time = distance / rate = ------------------- = (1/30) hr
60 km/hr
(1/30) hr converts to 2 minutes, since 1 hr = 60 minutes
Step-by-step explanation:
please mark me as brainlest
This is a relatively simple half life calculation.
To go from 6 to 3 grams, 1622 years is required.
3 to 1.5 grams another 1622 years is required.
So, it undergoes exactly 2 half-lives or 3,244 years.
To see more about half-life click here:
http://www.1728.org/halflife.htm
It should be 986m
4(17x6)= 408
2(17x17)= 578
408+578=986
