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If the average (arithmetic mean) of x and y is k, which of the following is the average of x,y, and z?
a) 2k+z/3
b) 2k+z/2
c) k+z/3
d) k+z/2
e) 2(k+z)/3
In the xy plane, line l passes through the origin and is perpendicular to the line 4x+y = k, where k is constant.
If the two lines intersect at the point (t,t+1), what is the value of t?
a) -4/3
b) -5/4
c) 3/4
d) 5/4
e) 4/3
How do you figure this out?
If x and y are positive consecutive odd integers, where y>x, which of the following is equal to y^2-x^2?
a) 2x
b) 4x
c) 2x+2
d) 2x+4
e) 4x+4
oops..
got it...
just plug x=1, y=3
then only answer is e
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