Plutonium-238 has a yearly decay constant of 7.9 x 109. if an original same
inal sample has a mass of 15 grams, how long will it take to decay to 12 grams
(a = apok
oa 3 years
ob. 12.3 years
oc. 28 3 years
od. 139.1 years

10000

step-by-step explanation: divide by 2,

answer: it's d

step-by-step explanation:

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.