10x - y = 2 5x + 3y = 5 --
1 answer:
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Answer:
B
Step-by-step explanation:
The chances of the first student walking to school is 7/30.
Without replacement, there are 29 students left. Hence the chance of the second student walking to school is 6/29 of the original 7/30 chance.
The area of a circle in terms of the circle's radius 
is
Differentiating both sides with respect to
, you get
Differentiating both sides with respect to