240 days is 4 times the half-life, which means that a sample of 1000 mg will decay to

after 240 days.
Adding both equations cancels y:
<span>4x + 8y = 16
</span><span>4x - 8y = 0
-----------------+
8x = 16 => x=2
filling in x=2 in the first equation gives:
4*2 + 8y = 16 => 8y = 8 => y=1
So (2,1) is the (x,y) pair that solves the two equations. Answer C.</span>
Answer: m= 3/2
Step-by-step explanation:
Because....
if you use the slope formula y2-y1/y2-y1 .
It's going to be....

Therefor, the answer is m = 
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Answer:
25 feet
Step-by-step explanation:
Multiply 2.5 and 10