Select the correct answer. Consider this quadratic equation.
x2 + 1 = 2x-3
Which expression correctly sets up the quadratic formula?
A. -(-2) = V(-2)2 – 4(1)(4)
2(1)
B.-(-2) + 2)2 – (1)(4)
2(2)
c. -2 V2)2 – 4(1)(4)
2(1)
-2 (2)2 - 4(1)(-2)
2(1)
D.

0 is its x and y coordinate

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the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).