Answer:
SAS Similarity
Step-by-step explanation:
ΔOPQ similar to ΔRST
∠Q = ∠T
OQ : RT = 28 : 84 = 1 : 3
QP : TS = 16 : 48 = 1 : 3
The measures of two sides of ΔOPQ are proportional to the measure of two side of ΔRST and their included angles are congruent. The triangles are similar by SAS Similarity.
wait wait wait I feel like I did this before but I don't at the same time-
I have no brain too so yeah sorry- :((
I would do it like this:
0.1 of 300 is 30, right?
then 0.3 = 3 * 30 = 90, easy...
now <span>hundredth part:</span>
300 * 0.01 = 3,
0.02 = 2 * 0.01 = 6
90 + 6 = 96
Answer:
10.96 hours will take for 85% of the lead to decay.
Step-by-step explanation:
Suppose A represents the amount of Pb-209 at time t,
According to the question,
Let 
be the initial amount,
Since, the half-life of 3.3 hours.
Here, 
By substituting the values,
