<h3>
Answer:</h3>
60 days
<h3>
Explanation:</h3>
Half-life is the amount of time it takes half of a substance to decay away.
Guess and Check
One method for solving half-life problems like this is to guess and check. To do this, we can continue to divide 475mg by 2 until we get to 30mg.
- 475 ÷ 2 = 237.5
- 237.5 ÷ 2 = 118.75
- 118.75 ÷ 2 = 59.375
- 59.375 ÷ 2 = 29.6875
As seen here, it takes approximately 4 half-lives for this sample of Ra-225 to decay to 30mg. Now, we can multiply 4 by the length of the half-life, 15 days.
Fractions
Another way to solve this is to use fractions.
- 16 is equivalent to
.
This means that it takes 4 half-lives for 475mg to decay to 30mg. Using the same method above, we can tell that 4 half-lives are 60 days.
Important Note
In this question, I rounded occasionally. So, not all of the values are exact, but they are all very close.
The example of Lesson 22 understand angle relationships in triangles i that the measure of the angle given in the image attached is 65°; supplementary angles add up to 180°.
<h3>What are the angle relationships in triangles?</h3>
There is the Interior angles which is known to have its both on the inside to be of parallel lines and as such, they are supplementary.
An example of Angle Pair Relationship are:
- Complementary Angles
- Supplementary Angles
- Adjacent Angles
The answer is 65° and it is a supplementary angles that can add up to 180°. Note that Two angles are called supplementary when their given measures when added together is up to 180 degrees.
See full question below
What is the measure of ∠DEF? How do you know?
answer choices
65°; supplementary angles add up to 180°
65°; complementary angles add up to 180°
45°; alternate interior angles add up to 90°
135°; supplementary angles add up to 180°
Learn more about angle relationships from
brainly.com/question/2953874
Answer:
Q: The linguistic relativity hypothesis of Benjamin Whorf suggests which of the following?
A: Speakers of different languages think differently due to the differences in their languages.
Answer:
sᴀɢᴜᴛᴀɴ ᴍᴏ ɴɢ ɪʏᴏ ᴡᴀɢ ᴋᴀɴɢ ᴛᴀᴍᴀᴅ ᴛᴀɴɢ ɪɴᴀ ᴍᴏ
