A radioactive substance has a decay rate of 0.079 per minute. How many grams of a 200 gram sample will remain radioactive after 1 hour? Round the answer to the nearest tenth of a gram, and do not include the unit in your answer.

1.75 g of 200g sample will remain radioactive after 1 hour

Explanation:

Given:

Decay rate, r = 0.079 per minute

Time, t = 1 hr = 60 min

Amount of the sample = 200 g

According to decay formula:

On substituting the value we get:

Therefore, 1.75 g of 200g sample will remain radioactive after 1 hour

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two