Answer:
either he is playing hard to get or he ain't worth your time so don't waste it on him
Answer:
Explanation:
I am sorry to hear that. What I can say is that many times the security system itself flags certain characters or phrases within a question and it is because of these that the question is automatically removed. Usually, it is because these characters or sentences have been known to be used in a vast number of questions that violate the guidelines, and since there are literally thousands of questions a day the system helps limit the number of these violations. I recommend reaching out to customer support and sending them a copy of your question, exactly how it was written so that they can help you.
The time it takes for 1g of strontium-90 to decay to 250 mg is; 57.6 years
<h3>What is the half life of an element?</h3>
The formula for half life is;
A(t) = A₀ * (¹/₂)^(t/t_1/2)
Where;
A(t) is amount left after t years
A₀ the initial quantity of the substance that will undergo decay;
t_1/2 is the half-life of the decaying quantity.
We are given;
t_1/2 = 28.8 years
A₀ = 1 g
A(t) = 250 mg = 0.25 g
Thus;
0.25 = 1 * (¹/₂)^(t/28.8)
log 0.25 = (t/28.8) log (1/2)
-0.60206 = (t/28.8) * -0.3010
t = 2 * 28.8
t = 57.6 years
Read more about half life at; brainly.com/question/11152793
Answer:A B+ is a 3.3 and a B- is a 3.0. Some schools might weight it differently, though, so it's best to email one of your teachers.
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