Whoever answers it's first gets the
rutherfordium- 265 is a radioactive substance that has a half-life of 13 hours. if there is a 149g sample of rutherfordium- 265 left at 12am on october 19th, approximately how much rutherfordium- 265 would remain on october 22nd at 12am?

a. 0.018 grams
b. 3.21 grams
c. 0.3 grams
d. 0.89 grams

➷ Calculate the number of hours:

24 x 3 = 72

72/13 = 5.5

This is 5 whole half lives

You have to half the value 5 times

149/2 = 74.5

74.5/2 = 37.25

37.25/2 = 18.625

18.625/2 = 9.3125

9.3125/2 = 4.65625

The closest value is B. 3.21 so that should be the answer

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answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)

$30.32

step-by-step explanation:

65.00*.12=2.80

65.00-2.80=57.20

57.20*1.06=60.632

60.632/2=30.316