MilyYang

This page lists questions and answers that were posted by visitors named MilyYang.

Questions

The following questions were asked by visitors named MilyYang.

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 B. 9 C. 23 D. 121

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=?

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 is _ ? A. 1+k B. 1-k C. (1+k)/2 D. (1-k)/2

Answers

The following answers were posted by visitors named MilyYang.