Step-by-step explanation:
Let x = number of games that Alex played
The total money that he spent C is given by
If he spent $45, then we can write

Solving for x, we get

This means that Alex played 15 games.
Hey do you have a question you have to read
A rhombus has all sides of equal length, while a parallelogram not necessarily.
after 6.2 hours the dose will decay to 70% in your bloodstream.
<h3>How long you must wait for the dosage to decay to 70% in your bloodstream?</h3>
We know that the half-life is 12 hours. Then the exponential relation for an initial dosage of A is:

If the dosage needs to decay to a 70% of the initial dosage, then we must have:

Now we need to solve that for t:
If we apply the natural logarithm in both sides, we get:

So after 6.2 hours the dose will decay to 70% in your bloodstream.
If you want to learn more about half-life:
brainly.com/question/11152793
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F (-5) = (4/5 × -5) + 4
= (-4) + 4
= 0