Answer:
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D choice.
Step-by-step explanation:
Law of Exponent:
Compare:
Therefore:
After reading through the story problem, I ended up with this equation:
(35-2)(x+.5) =?
or
(35-2)(10+.5)=?
Explanation:
He sells 35 books for usual weeks. Since he is selling his books at $.50 more his average number of copies decreased by 2.
35-2 = 33
Next, we know that he adds $.50 for his price for each copy. If the price is $10 per copy than it looks like this:
$10+$.50= 10+.5
or if the price is not $10 it will be
$x+$.5= x+.5
2x² + x -1 = 0
x² + x² + x -1 = 0
(x² - 1) + x² + x =0
(x + 1) (x - 1) + x(x + 1) =0
(x+1) (x - 1 + x) = 0
(x + 1)(2x - 1) = 0