Find an equation y = mx + b that models the quantity y after x units of time.A quantity y is initially 10 and decreases at a rate of 21 per day.
A. y = -10x - 21
B. y = -21x - 10
C. y = -10x + 21
D. y = -21x + 10
Answer: D
Mathematics
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- 
A. - 
B. 
C. - 
D. 
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