Answer:

Step-by-step explanation:
Before subtracting we require the fractions to have a common denominator.
The lowest common multiple of x + 4 and x + 6 is (x + 4)(x + 6)
Multiply the numerator/denominator of the first fraction by x + 6 and
multiply the numerator/denominator of the second fraction by x + 4
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Expand the numerators and simplify leaving the denominator
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The answer is B
the cost of each doll (2.5) times the number of dolls (x) equals the total amount she has to spend (45)
That's right! 3/4 of 3/4 means multiplying 3/4 by 3/4.
The cost is dependent on the time played because the cost and go up without the time going up