The amount of strontium that will remain after 40 hours is 5 g
<h3>How to determine the number of half-lives </h3>
- Half-life (t½) = 10 hours
- Time (t) = 40 hours
- Number of half-lives (n) =?
n = t / t½
n = 40 / 10
n = 4
<h3>How to determine the amount remaining </h3>
- Original amount (N₀) = 80 g
- Number of half-lives (n) = 4
N = N₀ / 2ⁿ
N = 80 / 2⁴
N = 80 / 16
N = 5 g
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brainly.com/question/26374513
To find the minimum score, you will consider that the mean of 80 must spread out between all possible scores.
Because the last exam counts double, you will consider 5 scores.
5 x 80 = 400 total points are what Tina needs.
400 - (94 + 68 + 88) = 150.
She must earn half of 150 points on her exam to earn an 80% overall grade.
A 75 is what Tina will need.
Answer:
well there will be a lot of lines , so this one per example y=-3x, so if you add a value just like this -3x +2, this also is parallel to the line 3x+y=8
Argument
The only number he can't roll is the number one. There are 5 numbers that he can roll.
The probability of success therefore is 5/6.
Formula
Number of successful rolls = probability of success * total number of rolls.
Total number of rolls = 78
Probability = 5/6
Number of successful Rolls = 5/6 * 78
Number of successful Rolls = 390/6
Number of successful Rolls = 65
Answer
He should roll a number greater than one 65 times <<<<< answer
Answer: ummm
Step-by-step explanation: