Answer:
Correct choice is D
Step-by-step explanation:
Notion means that you have to consider RAY with initial point C that goes in direction to point D (to the right).
Option A is false, because ray has initial point D and goes in direction to point C (to the left).
Option B is false, because ray has initial point C and goes in direction to point A (to the left).
Option C is false, because ray has initial point E and goes in direction to point C (to the left).
Option D is true, because ray has initial point C and goes in direction to points D and E (to the right).
P(7,6), Q(1,6), R(4,2)
We have PQ parallel to the x axis. We'll call that the base,
b = 7 - 1 = 6
The altitude is then the y difference h = 6 - 2 = 4
The area is
Answer: 12 square units
In general we can use the shoelace formula for the area of any polygon given coordinates. We write the points like this:
(7,6), (1,6), (4,2)
(1,6), (4,2), (7,6)
The area is then half the absolute value of the sum of the cross products:
Answer:
Percentage of (226Ra) after 900 years is 68%
Step-by-step explanation:
Let P(t) be the amount of (226Ra) present at any time t
Half life of (226 Ra) = 1599 years
If P₀ is initial amount of (226 Ra) then after 1599 years
P(1599)=P₀/2
Decay i amount of radioactive substance is related to time t as
To find value of k
Percentage of radioactive element is:
Amount after 900 years