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MilyYang
Questions (3)
If the straight line x-y=k and the circle x^2+y^2+2x-4y-1=0 intersect at A and B, then the x-coordinate of the mid-point of AB
1 answer
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Let f(x)=3x^2-6x+k, where k is a constant. If the y-coordinate of the vertex of the graph of y=f(x) is 7, then k=?
1 answer
349 views
If the variance of the four numbers a,b,c and d is 9, then the variance of the four numbers 14-a, 14-b, 14-c and 14-d is _?
A. 5
1 answer
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