"of" means multiply, "was/is" means equals
started driving price was 1/4 of current price
? = 1/4 x 3.16
? = 3.16/4
? = .89
Answer: $0.89
The equation would be written like this 2x-10=48. First add 10 to both sides so 2x-10+10=48+10 so simplified that is 2x=58. Now, divide both sides by 2 to get x by itself so it will look like this 2x/2=58/2 simplified that is x=29. I hope this helped you.
This is a fairly easy half-life problem
Each half-life reduces the radioactive material by one half.
So after 72 hours the radioactive material would have undergone 6 half-lives.
2^6 = 64.
So, there will be one sixty-fourth of the material left.
520 / 64 = 8.125 grams will remain.
radioactive decay is an exponential decay function.
Source:
http://www.1728.org/halflife.htm
Drawing a picture would be helpful.
So you have AB and BC, and AC is ALL of AB and BC. In other words,
AC = AB+BC.
Now plug in what the problem gave you.
(16) = (x^2 -10) + (2x + 2)
16 = x^2 + 2x - 8
0 = x^2 + 2x -24
0 = (x+6)(x-4)
x = -6, 4
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