4. suppose a laboratory has a 31 g sample of polonium-210. the half-life of
polonium-210 is about 138 days.
a. how many half-lives of polonium-210 occur in 966 days?
b. how much polonium is in the sample 966 days later?

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

i dont know what you want me to answer for this but im guessing 2: 11?

|-23|, |29|, |34|, |-38|, |-45|, |-47|, |-59|,   |67|, |-78|, |-110|, |-514|, |710|

step-by-step explanation:

absolute value gets rid of any negative

answer: corresponding angles

explanation: both angles are at two different sides which makes it seem like a would be the right choice however both are exactly the same, no matter of their placement both have the same degree

a could be the answer just as much as c, some more info would us answer. hope this