The answer is D. In the function 
, A value of 5 would make the denominator 0. This is undefined, so 5 is excluded.
7b) A recipe for salad dressing calls for 3 tablespoons of oil for every 2 tablespoons of
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We can begin by rearranging this into multiplication:
Now we can factor the numerators and denominators:
The factors (x+4) and (x+2) cancel out, leaving us with:
Our answer comes out to be:
Based on the numerator of the second fraction (since we used its inverse), the denominators of both, and the factors we canceled out earlier, the restrictions are x ≠ -4, -3, -2, -1, 4